Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

1 files changed, 2988 insertions, 0 deletions

diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
new file mode 100644
index 000000000..c3d976c80
--- /dev/null
+++ b/lib/locking-selftest.c
@@ -0,0 +1,2988 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * lib/locking-selftest.c
+ *
+ * Testsuite for various locking APIs: spinlocks, rwlocks,
+ * mutexes and rw-semaphores.
+ *
+ * It is checking both false positives and false negatives.
+ *
+ * Started by Ingo Molnar:
+ *
+ *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ */
+#include <linux/rwsem.h>
+#include <linux/mutex.h>
+#include <linux/ww_mutex.h>
+#include <linux/sched.h>
+#include <linux/sched/mm.h>
+#include <linux/delay.h>
+#include <linux/lockdep.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+#include <linux/debug_locks.h>
+#include <linux/irqflags.h>
+#include <linux/rtmutex.h>
+#include <linux/local_lock.h>
+
+#ifdef CONFIG_PREEMPT_RT
+# define NON_RT(...)
+#else
+# define NON_RT(...)	__VA_ARGS__
+#endif
+
+/*
+ * Change this to 1 if you want to see the failure printouts:
+ */
+static unsigned int debug_locks_verbose;
+unsigned int force_read_lock_recursive;
+
+static DEFINE_WD_CLASS(ww_lockdep);
+
+static int __init setup_debug_locks_verbose(char *str)
+{
+	get_option(&str, &debug_locks_verbose);
+
+	return 1;
+}
+
+__setup("debug_locks_verbose=", setup_debug_locks_verbose);
+
+#define FAILURE		0
+#define SUCCESS		1
+
+#define LOCKTYPE_SPIN	0x1
+#define LOCKTYPE_RWLOCK	0x2
+#define LOCKTYPE_MUTEX	0x4
+#define LOCKTYPE_RWSEM	0x8
+#define LOCKTYPE_WW	0x10
+#define LOCKTYPE_RTMUTEX 0x20
+#define LOCKTYPE_LL	0x40
+#define LOCKTYPE_SPECIAL 0x80
+
+static struct ww_acquire_ctx t, t2;
+static struct ww_mutex o, o2, o3;
+
+/*
+ * Normal standalone locks, for the circular and irq-context
+ * dependency tests:
+ */
+static DEFINE_SPINLOCK(lock_A);
+static DEFINE_SPINLOCK(lock_B);
+static DEFINE_SPINLOCK(lock_C);
+static DEFINE_SPINLOCK(lock_D);
+
+static DEFINE_RAW_SPINLOCK(raw_lock_A);
+static DEFINE_RAW_SPINLOCK(raw_lock_B);
+
+static DEFINE_RWLOCK(rwlock_A);
+static DEFINE_RWLOCK(rwlock_B);
+static DEFINE_RWLOCK(rwlock_C);
+static DEFINE_RWLOCK(rwlock_D);
+
+static DEFINE_MUTEX(mutex_A);
+static DEFINE_MUTEX(mutex_B);
+static DEFINE_MUTEX(mutex_C);
+static DEFINE_MUTEX(mutex_D);
+
+static DECLARE_RWSEM(rwsem_A);
+static DECLARE_RWSEM(rwsem_B);
+static DECLARE_RWSEM(rwsem_C);
+static DECLARE_RWSEM(rwsem_D);
+
+#ifdef CONFIG_RT_MUTEXES
+
+static DEFINE_RT_MUTEX(rtmutex_A);
+static DEFINE_RT_MUTEX(rtmutex_B);
+static DEFINE_RT_MUTEX(rtmutex_C);
+static DEFINE_RT_MUTEX(rtmutex_D);
+
+#endif
+
+/*
+ * Locks that we initialize dynamically as well so that
+ * e.g. X1 and X2 becomes two instances of the same class,
+ * but X* and Y* are different classes. We do this so that
+ * we do not trigger a real lockup:
+ */
+static DEFINE_SPINLOCK(lock_X1);
+static DEFINE_SPINLOCK(lock_X2);
+static DEFINE_SPINLOCK(lock_Y1);
+static DEFINE_SPINLOCK(lock_Y2);
+static DEFINE_SPINLOCK(lock_Z1);
+static DEFINE_SPINLOCK(lock_Z2);
+
+static DEFINE_RWLOCK(rwlock_X1);
+static DEFINE_RWLOCK(rwlock_X2);
+static DEFINE_RWLOCK(rwlock_Y1);
+static DEFINE_RWLOCK(rwlock_Y2);
+static DEFINE_RWLOCK(rwlock_Z1);
+static DEFINE_RWLOCK(rwlock_Z2);
+
+static DEFINE_MUTEX(mutex_X1);
+static DEFINE_MUTEX(mutex_X2);
+static DEFINE_MUTEX(mutex_Y1);
+static DEFINE_MUTEX(mutex_Y2);
+static DEFINE_MUTEX(mutex_Z1);
+static DEFINE_MUTEX(mutex_Z2);
+
+static DECLARE_RWSEM(rwsem_X1);
+static DECLARE_RWSEM(rwsem_X2);
+static DECLARE_RWSEM(rwsem_Y1);
+static DECLARE_RWSEM(rwsem_Y2);
+static DECLARE_RWSEM(rwsem_Z1);
+static DECLARE_RWSEM(rwsem_Z2);
+
+#ifdef CONFIG_RT_MUTEXES
+
+static DEFINE_RT_MUTEX(rtmutex_X1);
+static DEFINE_RT_MUTEX(rtmutex_X2);
+static DEFINE_RT_MUTEX(rtmutex_Y1);
+static DEFINE_RT_MUTEX(rtmutex_Y2);
+static DEFINE_RT_MUTEX(rtmutex_Z1);
+static DEFINE_RT_MUTEX(rtmutex_Z2);
+
+#endif
+
+static DEFINE_PER_CPU(local_lock_t, local_A);
+
+/*
+ * non-inlined runtime initializers, to let separate locks share
+ * the same lock-class:
+ */
+#define INIT_CLASS_FUNC(class) 				\
+static noinline void					\
+init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \
+	struct mutex *mutex, struct rw_semaphore *rwsem)\
+{							\
+	spin_lock_init(lock);			\
+	rwlock_init(rwlock);				\
+	mutex_init(mutex);				\
+	init_rwsem(rwsem);				\
+}
+
+INIT_CLASS_FUNC(X)
+INIT_CLASS_FUNC(Y)
+INIT_CLASS_FUNC(Z)
+
+static void init_shared_classes(void)
+{
+#ifdef CONFIG_RT_MUTEXES
+	static struct lock_class_key rt_X, rt_Y, rt_Z;
+
+	__rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
+	__rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
+	__rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
+	__rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
+	__rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
+	__rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
+#endif
+
+	init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
+	init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
+
+	init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
+	init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
+
+	init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
+	init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
+}
+
+/*
+ * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
+ * The following functions use a lock from a simulated hardirq/softirq
+ * context, causing the locks to be marked as hardirq-safe/softirq-safe:
+ */
+
+#define HARDIRQ_DISABLE		local_irq_disable
+#define HARDIRQ_ENABLE		local_irq_enable
+
+#define HARDIRQ_ENTER()				\
+	local_irq_disable();			\
+	__irq_enter();				\
+	lockdep_hardirq_threaded();		\
+	WARN_ON(!in_hardirq());
+
+#define HARDIRQ_EXIT()				\
+	__irq_exit();				\
+	local_irq_enable();
+
+#define SOFTIRQ_DISABLE		local_bh_disable
+#define SOFTIRQ_ENABLE		local_bh_enable
+
+#define SOFTIRQ_ENTER()				\
+		local_bh_disable();		\
+		local_irq_disable();		\
+		lockdep_softirq_enter();	\
+		WARN_ON(!in_softirq());
+
+#define SOFTIRQ_EXIT()				\
+		lockdep_softirq_exit();		\
+		local_irq_enable();		\
+		local_bh_enable();
+
+/*
+ * Shortcuts for lock/unlock API variants, to keep
+ * the testcases compact:
+ */
+#define L(x)			spin_lock(&lock_##x)
+#define U(x)			spin_unlock(&lock_##x)
+#define LU(x)			L(x); U(x)
+#define SI(x)			spin_lock_init(&lock_##x)
+
+#define WL(x)			write_lock(&rwlock_##x)
+#define WU(x)			write_unlock(&rwlock_##x)
+#define WLU(x)			WL(x); WU(x)
+
+#define RL(x)			read_lock(&rwlock_##x)
+#define RU(x)			read_unlock(&rwlock_##x)
+#define RLU(x)			RL(x); RU(x)
+#define RWI(x)			rwlock_init(&rwlock_##x)
+
+#define ML(x)			mutex_lock(&mutex_##x)
+#define MU(x)			mutex_unlock(&mutex_##x)
+#define MI(x)			mutex_init(&mutex_##x)
+
+#define RTL(x)			rt_mutex_lock(&rtmutex_##x)
+#define RTU(x)			rt_mutex_unlock(&rtmutex_##x)
+#define RTI(x)			rt_mutex_init(&rtmutex_##x)
+
+#define WSL(x)			down_write(&rwsem_##x)
+#define WSU(x)			up_write(&rwsem_##x)
+
+#define RSL(x)			down_read(&rwsem_##x)
+#define RSU(x)			up_read(&rwsem_##x)
+#define RWSI(x)			init_rwsem(&rwsem_##x)
+
+#ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
+#define WWAI(x)			ww_acquire_init(x, &ww_lockdep)
+#else
+#define WWAI(x)			do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
+#endif
+#define WWAD(x)			ww_acquire_done(x)
+#define WWAF(x)			ww_acquire_fini(x)
+
+#define WWL(x, c)		ww_mutex_lock(x, c)
+#define WWT(x)			ww_mutex_trylock(x, NULL)
+#define WWL1(x)			ww_mutex_lock(x, NULL)
+#define WWU(x)			ww_mutex_unlock(x)
+
+
+#define LOCK_UNLOCK_2(x,y)	LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
+
+/*
+ * Generate different permutations of the same testcase, using
+ * the same basic lock-dependency/state events:
+ */
+
+#define GENERATE_TESTCASE(name)			\
+						\
+static void name(void) { E(); }
+
+#define GENERATE_PERMUTATIONS_2_EVENTS(name)	\
+						\
+static void name##_12(void) { E1(); E2(); }	\
+static void name##_21(void) { E2(); E1(); }
+
+#define GENERATE_PERMUTATIONS_3_EVENTS(name)		\
+							\
+static void name##_123(void) { E1(); E2(); E3(); }	\
+static void name##_132(void) { E1(); E3(); E2(); }	\
+static void name##_213(void) { E2(); E1(); E3(); }	\
+static void name##_231(void) { E2(); E3(); E1(); }	\
+static void name##_312(void) { E3(); E1(); E2(); }	\
+static void name##_321(void) { E3(); E2(); E1(); }
+
+/*
+ * AA deadlock:
+ */
+
+#define E()					\
+						\
+	LOCK(X1);				\
+	LOCK(X2); /* this one should fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(AA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(AA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(AA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(AA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(AA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(AA_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(AA_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * Special-case for read-locking, they are
+ * allowed to recurse on the same lock class:
+ */
+static void rlock_AA1(void)
+{
+	RL(X1);
+	RL(X1); // this one should NOT fail
+}
+
+static void rlock_AA1B(void)
+{
+	RL(X1);
+	RL(X2); // this one should NOT fail
+}
+
+static void rsem_AA1(void)
+{
+	RSL(X1);
+	RSL(X1); // this one should fail
+}
+
+static void rsem_AA1B(void)
+{
+	RSL(X1);
+	RSL(X2); // this one should fail
+}
+/*
+ * The mixing of read and write locks is not allowed:
+ */
+static void rlock_AA2(void)
+{
+	RL(X1);
+	WL(X2); // this one should fail
+}
+
+static void rsem_AA2(void)
+{
+	RSL(X1);
+	WSL(X2); // this one should fail
+}
+
+static void rlock_AA3(void)
+{
+	WL(X1);
+	RL(X2); // this one should fail
+}
+
+static void rsem_AA3(void)
+{
+	WSL(X1);
+	RSL(X2); // this one should fail
+}
+
+/*
+ * read_lock(A)
+ * spin_lock(B)
+ *		spin_lock(B)
+ *		write_lock(A)
+ */
+static void rlock_ABBA1(void)
+{
+	RL(X1);
+	L(Y1);
+	U(Y1);
+	RU(X1);
+
+	L(Y1);
+	WL(X1);
+	WU(X1);
+	U(Y1); // should fail
+}
+
+static void rwsem_ABBA1(void)
+{
+	RSL(X1);
+	ML(Y1);
+	MU(Y1);
+	RSU(X1);
+
+	ML(Y1);
+	WSL(X1);
+	WSU(X1);
+	MU(Y1); // should fail
+}
+
+/*
+ * read_lock(A)
+ * spin_lock(B)
+ *		spin_lock(B)
+ *		write_lock(A)
+ *
+ * This test case is aimed at poking whether the chain cache prevents us from
+ * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
+ * read/write locks, the following case may happen
+ *
+ * 	{ read_lock(A)->lock(B) dependency exists }
+ *
+ * 	P0:
+ * 	lock(B);
+ * 	read_lock(A);
+ *
+ *	{ Not a deadlock, B -> A is added in the chain cache }
+ *
+ *	P1:
+ *	lock(B);
+ *	write_lock(A);
+ *
+ *	{ B->A found in chain cache, not reported as a deadlock }
+ *
+ */
+static void rlock_chaincache_ABBA1(void)
+{
+	RL(X1);
+	L(Y1);
+	U(Y1);
+	RU(X1);
+
+	L(Y1);
+	RL(X1);
+	RU(X1);
+	U(Y1);
+
+	L(Y1);
+	WL(X1);
+	WU(X1);
+	U(Y1); // should fail
+}
+
+/*
+ * read_lock(A)
+ * spin_lock(B)
+ *		spin_lock(B)
+ *		read_lock(A)
+ */
+static void rlock_ABBA2(void)
+{
+	RL(X1);
+	L(Y1);
+	U(Y1);
+	RU(X1);
+
+	L(Y1);
+	RL(X1);
+	RU(X1);
+	U(Y1); // should NOT fail
+}
+
+static void rwsem_ABBA2(void)
+{
+	RSL(X1);
+	ML(Y1);
+	MU(Y1);
+	RSU(X1);
+
+	ML(Y1);
+	RSL(X1);
+	RSU(X1);
+	MU(Y1); // should fail
+}
+
+
+/*
+ * write_lock(A)
+ * spin_lock(B)
+ *		spin_lock(B)
+ *		write_lock(A)
+ */
+static void rlock_ABBA3(void)
+{
+	WL(X1);
+	L(Y1);
+	U(Y1);
+	WU(X1);
+
+	L(Y1);
+	WL(X1);
+	WU(X1);
+	U(Y1); // should fail
+}
+
+static void rwsem_ABBA3(void)
+{
+	WSL(X1);
+	ML(Y1);
+	MU(Y1);
+	WSU(X1);
+
+	ML(Y1);
+	WSL(X1);
+	WSU(X1);
+	MU(Y1); // should fail
+}
+
+/*
+ * ABBA deadlock:
+ */
+
+#define E()					\
+						\
+	LOCK_UNLOCK_2(A, B);			\
+	LOCK_UNLOCK_2(B, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABBA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABBA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABBA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABBA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABBA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABBA_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(ABBA_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * AB BC CA deadlock:
+ */
+
+#define E()					\
+						\
+	LOCK_UNLOCK_2(A, B);			\
+	LOCK_UNLOCK_2(B, C);			\
+	LOCK_UNLOCK_2(C, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABBCCA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABBCCA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABBCCA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABBCCA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABBCCA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABBCCA_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(ABBCCA_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * AB CA BC deadlock:
+ */
+
+#define E()					\
+						\
+	LOCK_UNLOCK_2(A, B);			\
+	LOCK_UNLOCK_2(C, A);			\
+	LOCK_UNLOCK_2(B, C); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABCABC_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABCABC_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABCABC_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABCABC_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABCABC_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABCABC_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(ABCABC_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * AB BC CD DA deadlock:
+ */
+
+#define E()					\
+						\
+	LOCK_UNLOCK_2(A, B);			\
+	LOCK_UNLOCK_2(B, C);			\
+	LOCK_UNLOCK_2(C, D);			\
+	LOCK_UNLOCK_2(D, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABBCCDDA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABBCCDDA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABBCCDDA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABBCCDDA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABBCCDDA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABBCCDDA_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(ABBCCDDA_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * AB CD BD DA deadlock:
+ */
+#define E()					\
+						\
+	LOCK_UNLOCK_2(A, B);			\
+	LOCK_UNLOCK_2(C, D);			\
+	LOCK_UNLOCK_2(B, D);			\
+	LOCK_UNLOCK_2(D, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABCDBDDA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABCDBDDA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABCDBDDA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABCDBDDA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABCDBDDA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABCDBDDA_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(ABCDBDDA_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * AB CD BC DA deadlock:
+ */
+#define E()					\
+						\
+	LOCK_UNLOCK_2(A, B);			\
+	LOCK_UNLOCK_2(C, D);			\
+	LOCK_UNLOCK_2(B, C);			\
+	LOCK_UNLOCK_2(D, A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(ABCDBCDA_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(ABCDBCDA_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(ABCDBCDA_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(ABCDBCDA_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(ABCDBCDA_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(ABCDBCDA_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(ABCDBCDA_rtmutex);
+#endif
+
+#undef E
+
+#ifdef CONFIG_PREEMPT_RT
+# define RT_PREPARE_DBL_UNLOCK()	{ migrate_disable(); rcu_read_lock(); }
+#else
+# define RT_PREPARE_DBL_UNLOCK()
+#endif
+/*
+ * Double unlock:
+ */
+#define E()					\
+						\
+	LOCK(A);				\
+	RT_PREPARE_DBL_UNLOCK();		\
+	UNLOCK(A);				\
+	UNLOCK(A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(double_unlock_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(double_unlock_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(double_unlock_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(double_unlock_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(double_unlock_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(double_unlock_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(double_unlock_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * initializing a held lock:
+ */
+#define E()					\
+						\
+	LOCK(A);				\
+	INIT(A); /* fail */
+
+/*
+ * 6 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_TESTCASE(init_held_spin)
+#include "locking-selftest-wlock.h"
+GENERATE_TESTCASE(init_held_wlock)
+#include "locking-selftest-rlock.h"
+GENERATE_TESTCASE(init_held_rlock)
+#include "locking-selftest-mutex.h"
+GENERATE_TESTCASE(init_held_mutex)
+#include "locking-selftest-wsem.h"
+GENERATE_TESTCASE(init_held_wsem)
+#include "locking-selftest-rsem.h"
+GENERATE_TESTCASE(init_held_rsem)
+
+#ifdef CONFIG_RT_MUTEXES
+#include "locking-selftest-rtmutex.h"
+GENERATE_TESTCASE(init_held_rtmutex);
+#endif
+
+#undef E
+
+/*
+ * locking an irq-safe lock with irqs enabled:
+ */
+#define E1()				\
+					\
+	IRQ_ENTER();			\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	IRQ_EXIT();
+
+#define E2()				\
+					\
+	LOCK(A);			\
+	UNLOCK(A);
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+
+#ifndef CONFIG_PREEMPT_RT
+/*
+ * Enabling hardirqs with a softirq-safe lock held:
+ */
+#define E1()				\
+					\
+	SOFTIRQ_ENTER();		\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	SOFTIRQ_EXIT();
+
+#define E2()				\
+					\
+	HARDIRQ_DISABLE();		\
+	LOCK(A);			\
+	HARDIRQ_ENABLE();		\
+	UNLOCK(A);
+
+/*
+ * Generate 12 testcases:
+ */
+#include "locking-selftest-spin.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
+
+#undef E1
+#undef E2
+
+#endif
+
+/*
+ * Enabling irqs with an irq-safe lock held:
+ */
+#define E1()				\
+					\
+	IRQ_ENTER();			\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	IRQ_EXIT();
+
+#define E2()				\
+					\
+	IRQ_DISABLE();			\
+	LOCK(A);			\
+	IRQ_ENABLE();			\
+	UNLOCK(A);
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+
+/*
+ * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
+ */
+#define E1()				\
+					\
+	LOCK(A);			\
+	LOCK(B);			\
+	UNLOCK(B);			\
+	UNLOCK(A);			\
+
+#define E2()				\
+					\
+	LOCK(B);			\
+	UNLOCK(B);
+
+#define E3()				\
+					\
+	IRQ_ENTER();			\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	IRQ_EXIT();
+
+/*
+ * Generate 36 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * If a lock turns into softirq-safe, but earlier it took
+ * a softirq-unsafe lock:
+ */
+
+#define E1()				\
+	IRQ_DISABLE();			\
+	LOCK(A);			\
+	LOCK(B);			\
+	UNLOCK(B);			\
+	UNLOCK(A);			\
+	IRQ_ENABLE();
+
+#define E2()				\
+	LOCK(B);			\
+	UNLOCK(B);
+
+#define E3()				\
+	IRQ_ENTER();			\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	IRQ_EXIT();
+
+/*
+ * Generate 36 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * read-lock / write-lock irq inversion.
+ *
+ * Deadlock scenario:
+ *
+ * CPU#1 is at #1, i.e. it has write-locked A, but has not
+ * taken B yet.
+ *
+ * CPU#2 is at #2, i.e. it has locked B.
+ *
+ * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
+ *
+ * The deadlock occurs because CPU#1 will spin on B, and CPU#2
+ * will spin on A.
+ */
+
+#define E1()				\
+					\
+	IRQ_DISABLE();			\
+	WL(A);				\
+	LOCK(B);			\
+	UNLOCK(B);			\
+	WU(A);				\
+	IRQ_ENABLE();
+
+#define E2()				\
+					\
+	LOCK(B);			\
+	UNLOCK(B);
+
+#define E3()				\
+					\
+	IRQ_ENTER();			\
+	RL(A);				\
+	RU(A);				\
+	IRQ_EXIT();
+
+/*
+ * Generate 36 testcases:
+ */
+#include "locking-selftest-spin-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
+
+#include "locking-selftest-rlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
+
+#include "locking-selftest-wlock-hardirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-spin-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
+
+#include "locking-selftest-rlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
+
+#include "locking-selftest-wlock-softirq.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-read / write-read / write-read deadlock even if read is recursive
+ */
+
+#define E1()				\
+					\
+	WL(X1);				\
+	RL(Y1);				\
+	RU(Y1);				\
+	WU(X1);
+
+#define E2()				\
+					\
+	WL(Y1);				\
+	RL(Z1);				\
+	RU(Z1);				\
+	WU(Y1);
+
+#define E3()				\
+					\
+	WL(Z1);				\
+	RL(X1);				\
+	RU(X1);				\
+	WU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-write / read-read / write-read deadlock even if read is recursive
+ */
+
+#define E1()				\
+					\
+	WL(X1);				\
+	WL(Y1);				\
+	WU(Y1);				\
+	WU(X1);
+
+#define E2()				\
+					\
+	RL(Y1);				\
+	RL(Z1);				\
+	RU(Z1);				\
+	RU(Y1);
+
+#define E3()				\
+					\
+	WL(Z1);				\
+	RL(X1);				\
+	RU(X1);				\
+	WU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-write / read-read / read-write is not deadlock when read is recursive
+ */
+
+#define E1()				\
+					\
+	WL(X1);				\
+	WL(Y1);				\
+	WU(Y1);				\
+	WU(X1);
+
+#define E2()				\
+					\
+	RL(Y1);				\
+	RL(Z1);				\
+	RU(Z1);				\
+	RU(Y1);
+
+#define E3()				\
+					\
+	RL(Z1);				\
+	WL(X1);				\
+	WU(X1);				\
+	RU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * write-read / read-read / write-write is not deadlock when read is recursive
+ */
+
+#define E1()				\
+					\
+	WL(X1);				\
+	RL(Y1);				\
+	RU(Y1);				\
+	WU(X1);
+
+#define E2()				\
+					\
+	RL(Y1);				\
+	RL(Z1);				\
+	RU(Z1);				\
+	RU(Y1);
+
+#define E3()				\
+					\
+	WL(Z1);				\
+	WL(X1);				\
+	WU(X1);				\
+	WU(Z1);
+
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
+
+#undef E1
+#undef E2
+#undef E3
+/*
+ * read-lock / write-lock recursion that is actually safe.
+ */
+
+#define E1()				\
+					\
+	IRQ_DISABLE();			\
+	WL(A);				\
+	WU(A);				\
+	IRQ_ENABLE();
+
+#define E2()				\
+					\
+	RL(A);				\
+	RU(A);				\
+
+#define E3()				\
+					\
+	IRQ_ENTER();			\
+	LOCK(A);			\
+	L(B);				\
+	U(B);				\
+	UNLOCK(A);			\
+	IRQ_EXIT();
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-softirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+#undef E3
+
+/*
+ * read-lock / write-lock recursion that is unsafe.
+ */
+
+#define E1()				\
+					\
+	IRQ_DISABLE();			\
+	L(B);				\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	U(B);				\
+	IRQ_ENABLE();
+
+#define E2()				\
+					\
+	RL(A);				\
+	RU(A);				\
+
+#define E3()				\
+					\
+	IRQ_ENTER();			\
+	L(B);				\
+	U(B);				\
+	IRQ_EXIT();
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-softirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
+#endif
+
+#undef E1
+#undef E2
+#undef E3
+/*
+ * read-lock / write-lock recursion that is unsafe.
+ *
+ * A is a ENABLED_*_READ lock
+ * B is a USED_IN_*_READ lock
+ *
+ * read_lock(A);
+ *			write_lock(B);
+ * <interrupt>
+ * read_lock(B);
+ * 			write_lock(A); // if this one is read_lock(), no deadlock
+ */
+
+#define E1()				\
+					\
+	IRQ_DISABLE();			\
+	WL(B);				\
+	LOCK(A);			\
+	UNLOCK(A);			\
+	WU(B);				\
+	IRQ_ENABLE();
+
+#define E2()				\
+					\
+	RL(A);				\
+	RU(A);				\
+
+#define E3()				\
+					\
+	IRQ_ENTER();			\
+	RL(B);				\
+	RU(B);				\
+	IRQ_EXIT();
+
+/*
+ * Generate 24 testcases:
+ */
+#include "locking-selftest-hardirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
+
+#ifndef CONFIG_PREEMPT_RT
+#include "locking-selftest-softirq.h"
+#include "locking-selftest-rlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
+
+#include "locking-selftest-wlock.h"
+GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define I_SPINLOCK(x)	lockdep_reset_lock(&lock_##x.dep_map)
+# define I_RAW_SPINLOCK(x)	lockdep_reset_lock(&raw_lock_##x.dep_map)
+# define I_RWLOCK(x)	lockdep_reset_lock(&rwlock_##x.dep_map)
+# define I_MUTEX(x)	lockdep_reset_lock(&mutex_##x.dep_map)
+# define I_RWSEM(x)	lockdep_reset_lock(&rwsem_##x.dep_map)
+# define I_WW(x)	lockdep_reset_lock(&x.dep_map)
+# define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map))
+#ifdef CONFIG_RT_MUTEXES
+# define I_RTMUTEX(x)	lockdep_reset_lock(&rtmutex_##x.dep_map)
+#endif
+#else
+# define I_SPINLOCK(x)
+# define I_RAW_SPINLOCK(x)
+# define I_RWLOCK(x)
+# define I_MUTEX(x)
+# define I_RWSEM(x)
+# define I_WW(x)
+# define I_LOCAL_LOCK(x)
+#endif
+
+#ifndef I_RTMUTEX
+# define I_RTMUTEX(x)
+#endif
+
+#ifdef CONFIG_RT_MUTEXES
+#define I2_RTMUTEX(x)	rt_mutex_init(&rtmutex_##x)
+#else
+#define I2_RTMUTEX(x)
+#endif
+
+#define I1(x)					\
+	do {					\
+		I_SPINLOCK(x);			\
+		I_RWLOCK(x);			\
+		I_MUTEX(x);			\
+		I_RWSEM(x);			\
+		I_RTMUTEX(x);			\
+	} while (0)
+
+#define I2(x)					\
+	do {					\
+		spin_lock_init(&lock_##x);	\
+		rwlock_init(&rwlock_##x);	\
+		mutex_init(&mutex_##x);		\
+		init_rwsem(&rwsem_##x);		\
+		I2_RTMUTEX(x);			\
+	} while (0)
+
+static void reset_locks(void)
+{
+	local_irq_disable();
+	lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
+	lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
+
+	I1(A); I1(B); I1(C); I1(D);
+	I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
+	I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
+	I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B);
+	I_LOCAL_LOCK(A);
+
+	lockdep_reset();
+
+	I2(A); I2(B); I2(C); I2(D);
+	init_shared_classes();
+	raw_spin_lock_init(&raw_lock_A);
+	raw_spin_lock_init(&raw_lock_B);
+	local_lock_init(this_cpu_ptr(&local_A));
+
+	ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
+	memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
+	memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
+	memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
+	local_irq_enable();
+}
+
+#undef I
+
+static int testcase_total;
+static int testcase_successes;
+static int expected_testcase_failures;
+static int unexpected_testcase_failures;
+
+static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
+{
+	long saved_preempt_count = preempt_count();
+#ifdef CONFIG_PREEMPT_RT
+	int saved_mgd_count = current->migration_disabled;
+	int saved_rcu_count = current->rcu_read_lock_nesting;
+	int saved_sched_rt_mutex = current->sched_rt_mutex;
+#endif
+
+	WARN_ON(irqs_disabled());
+
+	debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
+
+	testcase_fn();
+	/*
+	 * Filter out expected failures:
+	 */
+#ifndef CONFIG_PROVE_LOCKING
+	if (expected == FAILURE && debug_locks) {
+		expected_testcase_failures++;
+		pr_cont("failed|");
+	}
+	else
+#endif
+	if (debug_locks != expected) {
+		unexpected_testcase_failures++;
+		pr_cont("FAILED|");
+	} else {
+		testcase_successes++;
+		pr_cont("  ok  |");
+	}
+	testcase_total++;
+
+	if (debug_locks_verbose & lockclass_mask)
+		pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
+			lockclass_mask, debug_locks, expected);
+	/*
+	 * Some tests (e.g. double-unlock) might corrupt the preemption
+	 * count, so restore it:
+	 */
+	preempt_count_set(saved_preempt_count);
+
+#ifdef CONFIG_PREEMPT_RT
+	current->sched_rt_mutex = saved_sched_rt_mutex;
+
+	while (current->migration_disabled > saved_mgd_count)
+		migrate_enable();
+
+	while (current->rcu_read_lock_nesting > saved_rcu_count)
+		rcu_read_unlock();
+	WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
+#endif
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+	if (softirq_count())
+		current->softirqs_enabled = 0;
+	else
+		current->softirqs_enabled = 1;
+#endif
+
+	reset_locks();
+}
+
+#ifdef CONFIG_RT_MUTEXES
+#define dotest_rt(fn, e, m)	dotest((fn), (e), (m))
+#else
+#define dotest_rt(fn, e, m)
+#endif
+
+static inline void print_testname(const char *testname)
+{
+	printk("%33s:", testname);
+}
+
+#define DO_TESTCASE_1(desc, name, nr)				\
+	print_testname(desc"/"#nr);				\
+	dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);		\
+	pr_cont("\n");
+
+#define DO_TESTCASE_1B(desc, name, nr)				\
+	print_testname(desc"/"#nr);				\
+	dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);		\
+	pr_cont("\n");
+
+#define DO_TESTCASE_1RR(desc, name, nr)				\
+	print_testname(desc"/"#nr);				\
+	pr_cont("             |");				\
+	dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK);		\
+	pr_cont("\n");
+
+#define DO_TESTCASE_1RRB(desc, name, nr)			\
+	print_testname(desc"/"#nr);				\
+	pr_cont("             |");				\
+	dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK);		\
+	pr_cont("\n");
+
+
+#define DO_TESTCASE_3(desc, name, nr)				\
+	print_testname(desc"/"#nr);				\
+	dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN);	\
+	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
+	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
+	pr_cont("\n");
+
+#define DO_TESTCASE_3RW(desc, name, nr)				\
+	print_testname(desc"/"#nr);				\
+	dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
+	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
+	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
+	pr_cont("\n");
+
+#define DO_TESTCASE_2RW(desc, name, nr)				\
+	print_testname(desc"/"#nr);				\
+	pr_cont("      |");					\
+	dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK);	\
+	dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK);	\
+	pr_cont("\n");
+
+#define DO_TESTCASE_2x2RW(desc, name, nr)			\
+	DO_TESTCASE_2RW("hard-"desc, name##_hard, nr)		\
+	NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr))	\
+
+#define DO_TESTCASE_6x2x2RW(desc, name)				\
+	DO_TESTCASE_2x2RW(desc, name, 123);			\
+	DO_TESTCASE_2x2RW(desc, name, 132);			\
+	DO_TESTCASE_2x2RW(desc, name, 213);			\
+	DO_TESTCASE_2x2RW(desc, name, 231);			\
+	DO_TESTCASE_2x2RW(desc, name, 312);			\
+	DO_TESTCASE_2x2RW(desc, name, 321);
+
+#define DO_TESTCASE_6(desc, name)				\
+	print_testname(desc);					\
+	dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);		\
+	dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);		\
+	dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK);		\
+	dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);		\
+	dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);		\
+	dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);		\
+	dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX);	\
+	pr_cont("\n");
+
+#define DO_TESTCASE_6_SUCCESS(desc, name)			\
+	print_testname(desc);					\
+	dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN);		\
+	dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK);		\
+	dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);		\
+	dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX);		\
+	dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM);		\
+	dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM);		\
+	dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX);	\
+	pr_cont("\n");
+
+/*
+ * 'read' variant: rlocks must not trigger.
+ */
+#define DO_TESTCASE_6R(desc, name)				\
+	print_testname(desc);					\
+	dotest(name##_spin, FAILURE, LOCKTYPE_SPIN);		\
+	dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK);		\
+	dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK);		\
+	dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX);		\
+	dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM);		\
+	dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM);		\
+	dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX);	\
+	pr_cont("\n");
+
+#define DO_TESTCASE_2I(desc, name, nr)				\
+	DO_TESTCASE_1("hard-"desc, name##_hard, nr);		\
+	NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr));
+
+#define DO_TESTCASE_2IB(desc, name, nr)				\
+	DO_TESTCASE_1B("hard-"desc, name##_hard, nr);		\
+	NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr));
+
+#define DO_TESTCASE_6I(desc, name, nr)				\
+	DO_TESTCASE_3("hard-"desc, name##_hard, nr);		\
+	NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr));
+
+#define DO_TESTCASE_6IRW(desc, name, nr)			\
+	DO_TESTCASE_3RW("hard-"desc, name##_hard, nr);		\
+	NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr));
+
+#define DO_TESTCASE_2x3(desc, name)				\
+	DO_TESTCASE_3(desc, name, 12);				\
+	DO_TESTCASE_3(desc, name, 21);
+
+#define DO_TESTCASE_2x6(desc, name)				\
+	DO_TESTCASE_6I(desc, name, 12);				\
+	DO_TESTCASE_6I(desc, name, 21);
+
+#define DO_TESTCASE_6x2(desc, name)				\
+	DO_TESTCASE_2I(desc, name, 123);			\
+	DO_TESTCASE_2I(desc, name, 132);			\
+	DO_TESTCASE_2I(desc, name, 213);			\
+	DO_TESTCASE_2I(desc, name, 231);			\
+	DO_TESTCASE_2I(desc, name, 312);			\
+	DO_TESTCASE_2I(desc, name, 321);
+
+#define DO_TESTCASE_6x2B(desc, name)				\
+	DO_TESTCASE_2IB(desc, name, 123);			\
+	DO_TESTCASE_2IB(desc, name, 132);			\
+	DO_TESTCASE_2IB(desc, name, 213);			\
+	DO_TESTCASE_2IB(desc, name, 231);			\
+	DO_TESTCASE_2IB(desc, name, 312);			\
+	DO_TESTCASE_2IB(desc, name, 321);
+
+#define DO_TESTCASE_6x1RR(desc, name)				\
+	DO_TESTCASE_1RR(desc, name, 123);			\
+	DO_TESTCASE_1RR(desc, name, 132);			\
+	DO_TESTCASE_1RR(desc, name, 213);			\
+	DO_TESTCASE_1RR(desc, name, 231);			\
+	DO_TESTCASE_1RR(desc, name, 312);			\
+	DO_TESTCASE_1RR(desc, name, 321);
+
+#define DO_TESTCASE_6x1RRB(desc, name)				\
+	DO_TESTCASE_1RRB(desc, name, 123);			\
+	DO_TESTCASE_1RRB(desc, name, 132);			\
+	DO_TESTCASE_1RRB(desc, name, 213);			\
+	DO_TESTCASE_1RRB(desc, name, 231);			\
+	DO_TESTCASE_1RRB(desc, name, 312);			\
+	DO_TESTCASE_1RRB(desc, name, 321);
+
+#define DO_TESTCASE_6x6(desc, name)				\
+	DO_TESTCASE_6I(desc, name, 123);			\
+	DO_TESTCASE_6I(desc, name, 132);			\
+	DO_TESTCASE_6I(desc, name, 213);			\
+	DO_TESTCASE_6I(desc, name, 231);			\
+	DO_TESTCASE_6I(desc, name, 312);			\
+	DO_TESTCASE_6I(desc, name, 321);
+
+#define DO_TESTCASE_6x6RW(desc, name)				\
+	DO_TESTCASE_6IRW(desc, name, 123);			\
+	DO_TESTCASE_6IRW(desc, name, 132);			\
+	DO_TESTCASE_6IRW(desc, name, 213);			\
+	DO_TESTCASE_6IRW(desc, name, 231);			\
+	DO_TESTCASE_6IRW(desc, name, 312);			\
+	DO_TESTCASE_6IRW(desc, name, 321);
+
+static void ww_test_fail_acquire(void)
+{
+	int ret;
+
+	WWAI(&t);
+	t.stamp++;
+
+	ret = WWL(&o, &t);
+
+	if (WARN_ON(!o.ctx) ||
+	    WARN_ON(ret))
+		return;
+
+	/* No lockdep test, pure API */
+	ret = WWL(&o, &t);
+	WARN_ON(ret != -EALREADY);
+
+	ret = WWT(&o);
+	WARN_ON(ret);
+
+	t2 = t;
+	t2.stamp++;
+	ret = WWL(&o, &t2);
+	WARN_ON(ret != -EDEADLK);
+	WWU(&o);
+
+	if (WWT(&o))
+		WWU(&o);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+	else
+		DEBUG_LOCKS_WARN_ON(1);
+#endif
+}
+
+#ifdef CONFIG_PREEMPT_RT
+#define ww_mutex_base_lock(b)			rt_mutex_lock(b)
+#define ww_mutex_base_trylock(b)		rt_mutex_trylock(b)
+#define ww_mutex_base_lock_nest_lock(b, b2)	rt_mutex_lock_nest_lock(b, b2)
+#define ww_mutex_base_lock_interruptible(b)	rt_mutex_lock_interruptible(b)
+#define ww_mutex_base_lock_killable(b)		rt_mutex_lock_killable(b)
+#define ww_mutex_base_unlock(b)			rt_mutex_unlock(b)
+#else
+#define ww_mutex_base_lock(b)			mutex_lock(b)
+#define ww_mutex_base_trylock(b)		mutex_trylock(b)
+#define ww_mutex_base_lock_nest_lock(b, b2)	mutex_lock_nest_lock(b, b2)
+#define ww_mutex_base_lock_interruptible(b)	mutex_lock_interruptible(b)
+#define ww_mutex_base_lock_killable(b)		mutex_lock_killable(b)
+#define ww_mutex_base_unlock(b)			mutex_unlock(b)
+#endif
+
+static void ww_test_normal(void)
+{
+	int ret;
+
+	/*
+	 * None of the ww_mutex codepaths should be taken in the 'normal'
+	 * mutex calls. The easiest way to verify this is by using the
+	 * normal mutex calls, and making sure o.ctx is unmodified.
+	 */
+
+	/* mutex_lock (and indirectly, mutex_lock_nested) */
+	o.ctx = (void *)~0UL;
+	ww_mutex_base_lock(&o.base);
+	ww_mutex_base_unlock(&o.base);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* mutex_lock_interruptible (and *_nested) */
+	o.ctx = (void *)~0UL;
+	ret = ww_mutex_base_lock_interruptible(&o.base);
+	if (!ret)
+		ww_mutex_base_unlock(&o.base);
+	else
+		WARN_ON(1);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* mutex_lock_killable (and *_nested) */
+	o.ctx = (void *)~0UL;
+	ret = ww_mutex_base_lock_killable(&o.base);
+	if (!ret)
+		ww_mutex_base_unlock(&o.base);
+	else
+		WARN_ON(1);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* trylock, succeeding */
+	o.ctx = (void *)~0UL;
+	ret = ww_mutex_base_trylock(&o.base);
+	WARN_ON(!ret);
+	if (ret)
+		ww_mutex_base_unlock(&o.base);
+	else
+		WARN_ON(1);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	/* trylock, failing */
+	o.ctx = (void *)~0UL;
+	ww_mutex_base_lock(&o.base);
+	ret = ww_mutex_base_trylock(&o.base);
+	WARN_ON(ret);
+	ww_mutex_base_unlock(&o.base);
+	WARN_ON(o.ctx != (void *)~0UL);
+
+	WWAI(&t);
+
+	/* nest_lock */
+	o.ctx = (void *)~0UL;
+	ww_mutex_base_lock_nest_lock(&o.base, &t);
+	ww_mutex_base_unlock(&o.base);
+	WARN_ON(o.ctx != (void *)~0UL);
+}
+
+static void ww_test_two_contexts(void)
+{
+	WWAI(&t);
+	WWAI(&t2);
+}
+
+static void ww_test_diff_class(void)
+{
+	WWAI(&t);
+#ifdef DEBUG_WW_MUTEXES
+	t.ww_class = NULL;
+#endif
+	WWL(&o, &t);
+}
+
+static void ww_test_context_done_twice(void)
+{
+	WWAI(&t);
+	WWAD(&t);
+	WWAD(&t);
+	WWAF(&t);
+}
+
+static void ww_test_context_unlock_twice(void)
+{
+	WWAI(&t);
+	WWAD(&t);
+	WWAF(&t);
+	WWAF(&t);
+}
+
+static void ww_test_context_fini_early(void)
+{
+	WWAI(&t);
+	WWL(&o, &t);
+	WWAD(&t);
+	WWAF(&t);
+}
+
+static void ww_test_context_lock_after_done(void)
+{
+	WWAI(&t);
+	WWAD(&t);
+	WWL(&o, &t);
+}
+
+static void ww_test_object_unlock_twice(void)
+{
+	WWL1(&o);
+	WWU(&o);
+	WWU(&o);
+}
+
+static void ww_test_object_lock_unbalanced(void)
+{
+	WWAI(&t);
+	WWL(&o, &t);
+	t.acquired = 0;
+	WWU(&o);
+	WWAF(&t);
+}
+
+static void ww_test_object_lock_stale_context(void)
+{
+	WWAI(&t);
+	o.ctx = &t2;
+	WWL(&o, &t);
+}
+
+static void ww_test_edeadlk_normal(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	o2.ctx = &t2;
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	o2.ctx = NULL;
+	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
+	ww_mutex_base_unlock(&o2.base);
+	WWU(&o);
+
+	WWL(&o2, &t);
+}
+
+static void ww_test_edeadlk_normal_slow(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	o2.ctx = NULL;
+	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
+	ww_mutex_base_unlock(&o2.base);
+	WWU(&o);
+
+	ww_mutex_lock_slow(&o2, &t);
+}
+
+static void ww_test_edeadlk_no_unlock(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	o2.ctx = &t2;
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	o2.ctx = NULL;
+	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
+	ww_mutex_base_unlock(&o2.base);
+
+	WWL(&o2, &t);
+}
+
+static void ww_test_edeadlk_no_unlock_slow(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	o2.ctx = NULL;
+	mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
+	ww_mutex_base_unlock(&o2.base);
+
+	ww_mutex_lock_slow(&o2, &t);
+}
+
+static void ww_test_edeadlk_acquire_more(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	ret = WWL(&o3, &t);
+}
+
+static void ww_test_edeadlk_acquire_more_slow(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	ww_mutex_lock_slow(&o3, &t);
+}
+
+static void ww_test_edeadlk_acquire_more_edeadlk(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	ww_mutex_base_lock(&o3.base);
+	mutex_release(&o3.base.dep_map, _THIS_IP_);
+	o3.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	ret = WWL(&o3, &t);
+	WARN_ON(ret != -EDEADLK);
+}
+
+static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	ww_mutex_base_lock(&o3.base);
+	mutex_release(&o3.base.dep_map, _THIS_IP_);
+	o3.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+
+	ww_mutex_lock_slow(&o3, &t);
+}
+
+static void ww_test_edeadlk_acquire_wrong(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+	if (!ret)
+		WWU(&o2);
+
+	WWU(&o);
+
+	ret = WWL(&o3, &t);
+}
+
+static void ww_test_edeadlk_acquire_wrong_slow(void)
+{
+	int ret;
+
+	ww_mutex_base_lock(&o2.base);
+	mutex_release(&o2.base.dep_map, _THIS_IP_);
+	o2.ctx = &t2;
+
+	WWAI(&t);
+	t2 = t;
+	t2.stamp--;
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret != -EDEADLK);
+	if (!ret)
+		WWU(&o2);
+
+	WWU(&o);
+
+	ww_mutex_lock_slow(&o3, &t);
+}
+
+static void ww_test_spin_nest_unlocked(void)
+{
+	spin_lock_nest_lock(&lock_A, &o.base);
+	U(A);
+}
+
+/* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
+static void ww_test_spin_nest_lock(void)
+{
+	spin_lock(&lock_X1);
+	spin_lock_nest_lock(&lock_Y1, &lock_X1);
+	spin_lock(&lock_A);
+	spin_lock_nest_lock(&lock_Y2, &lock_X1);
+	spin_unlock(&lock_A);
+	spin_unlock(&lock_Y2);
+	spin_unlock(&lock_Y1);
+	spin_unlock(&lock_X1);
+}
+
+static void ww_test_unneeded_slow(void)
+{
+	WWAI(&t);
+
+	ww_mutex_lock_slow(&o, &t);
+}
+
+static void ww_test_context_block(void)
+{
+	int ret;
+
+	WWAI(&t);
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+	WWL1(&o2);
+}
+
+static void ww_test_context_try(void)
+{
+	int ret;
+
+	WWAI(&t);
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWT(&o2);
+	WARN_ON(!ret);
+	WWU(&o2);
+	WWU(&o);
+}
+
+static void ww_test_context_context(void)
+{
+	int ret;
+
+	WWAI(&t);
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret);
+
+	WWU(&o2);
+	WWU(&o);
+}
+
+static void ww_test_try_block(void)
+{
+	bool ret;
+
+	ret = WWT(&o);
+	WARN_ON(!ret);
+
+	WWL1(&o2);
+	WWU(&o2);
+	WWU(&o);
+}
+
+static void ww_test_try_try(void)
+{
+	bool ret;
+
+	ret = WWT(&o);
+	WARN_ON(!ret);
+	ret = WWT(&o2);
+	WARN_ON(!ret);
+	WWU(&o2);
+	WWU(&o);
+}
+
+static void ww_test_try_context(void)
+{
+	int ret;
+
+	ret = WWT(&o);
+	WARN_ON(!ret);
+
+	WWAI(&t);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret);
+}
+
+static void ww_test_block_block(void)
+{
+	WWL1(&o);
+	WWL1(&o2);
+}
+
+static void ww_test_block_try(void)
+{
+	bool ret;
+
+	WWL1(&o);
+	ret = WWT(&o2);
+	WARN_ON(!ret);
+}
+
+static void ww_test_block_context(void)
+{
+	int ret;
+
+	WWL1(&o);
+	WWAI(&t);
+
+	ret = WWL(&o2, &t);
+	WARN_ON(ret);
+}
+
+static void ww_test_spin_block(void)
+{
+	L(A);
+	U(A);
+
+	WWL1(&o);
+	L(A);
+	U(A);
+	WWU(&o);
+
+	L(A);
+	WWL1(&o);
+	WWU(&o);
+	U(A);
+}
+
+static void ww_test_spin_try(void)
+{
+	bool ret;
+
+	L(A);
+	U(A);
+
+	ret = WWT(&o);
+	WARN_ON(!ret);
+	L(A);
+	U(A);
+	WWU(&o);
+
+	L(A);
+	ret = WWT(&o);
+	WARN_ON(!ret);
+	WWU(&o);
+	U(A);
+}
+
+static void ww_test_spin_context(void)
+{
+	int ret;
+
+	L(A);
+	U(A);
+
+	WWAI(&t);
+
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+	L(A);
+	U(A);
+	WWU(&o);
+
+	L(A);
+	ret = WWL(&o, &t);
+	WARN_ON(ret);
+	WWU(&o);
+	U(A);
+}
+
+static void ww_tests(void)
+{
+	printk("  --------------------------------------------------------------------------\n");
+	printk("  | Wound/wait tests |\n");
+	printk("  ---------------------\n");
+
+	print_testname("ww api failures");
+	dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("ww contexts mixing");
+	dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("finishing ww context");
+	dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("locking mismatches");
+	dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("EDEADLK handling");
+	dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("spinlock nest unlocked");
+	dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("spinlock nest test");
+	dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	printk("  -----------------------------------------------------\n");
+	printk("                                 |block | try  |context|\n");
+	printk("  -----------------------------------------------------\n");
+
+	print_testname("context");
+	dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("try");
+	dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("block");
+	dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+
+	print_testname("spinlock");
+	dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
+	dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
+	dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
+	pr_cont("\n");
+}
+
+
+/*
+ * <in hardirq handler>
+ * read_lock(&A);
+ *			<hardirq disable>
+ *			spin_lock(&B);
+ * spin_lock(&B);
+ *			read_lock(&A);
+ *
+ * is a deadlock.
+ */
+static void queued_read_lock_hardirq_RE_Er(void)
+{
+	HARDIRQ_ENTER();
+	read_lock(&rwlock_A);
+	LOCK(B);
+	UNLOCK(B);
+	read_unlock(&rwlock_A);
+	HARDIRQ_EXIT();
+
+	HARDIRQ_DISABLE();
+	LOCK(B);
+	read_lock(&rwlock_A);
+	read_unlock(&rwlock_A);
+	UNLOCK(B);
+	HARDIRQ_ENABLE();
+}
+
+/*
+ * <in hardirq handler>
+ * spin_lock(&B);
+ *			<hardirq disable>
+ *			read_lock(&A);
+ * read_lock(&A);
+ *			spin_lock(&B);
+ *
+ * is not a deadlock.
+ */
+static void queued_read_lock_hardirq_ER_rE(void)
+{
+	HARDIRQ_ENTER();
+	LOCK(B);
+	read_lock(&rwlock_A);
+	read_unlock(&rwlock_A);
+	UNLOCK(B);
+	HARDIRQ_EXIT();
+
+	HARDIRQ_DISABLE();
+	read_lock(&rwlock_A);
+	LOCK(B);
+	UNLOCK(B);
+	read_unlock(&rwlock_A);
+	HARDIRQ_ENABLE();
+}
+
+/*
+ * <hardirq disable>
+ * spin_lock(&B);
+ *			read_lock(&A);
+ *			<in hardirq handler>
+ *			spin_lock(&B);
+ * read_lock(&A);
+ *
+ * is a deadlock. Because the two read_lock()s are both non-recursive readers.
+ */
+static void queued_read_lock_hardirq_inversion(void)
+{
+
+	HARDIRQ_ENTER();
+	LOCK(B);
+	UNLOCK(B);
+	HARDIRQ_EXIT();
+
+	HARDIRQ_DISABLE();
+	LOCK(B);
+	read_lock(&rwlock_A);
+	read_unlock(&rwlock_A);
+	UNLOCK(B);
+	HARDIRQ_ENABLE();
+
+	read_lock(&rwlock_A);
+	read_unlock(&rwlock_A);
+}
+
+static void queued_read_lock_tests(void)
+{
+	printk("  --------------------------------------------------------------------------\n");
+	printk("  | queued read lock tests |\n");
+	printk("  ---------------------------\n");
+	print_testname("hardirq read-lock/lock-read");
+	dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
+	pr_cont("\n");
+
+	print_testname("hardirq lock-read/read-lock");
+	dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
+	pr_cont("\n");
+
+	print_testname("hardirq inversion");
+	dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
+	pr_cont("\n");
+}
+
+static void fs_reclaim_correct_nesting(void)
+{
+	fs_reclaim_acquire(GFP_KERNEL);
+	might_alloc(GFP_NOFS);
+	fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_wrong_nesting(void)
+{
+	fs_reclaim_acquire(GFP_KERNEL);
+	might_alloc(GFP_KERNEL);
+	fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_protected_nesting(void)
+{
+	unsigned int flags;
+
+	fs_reclaim_acquire(GFP_KERNEL);
+	flags = memalloc_nofs_save();
+	might_alloc(GFP_KERNEL);
+	memalloc_nofs_restore(flags);
+	fs_reclaim_release(GFP_KERNEL);
+}
+
+static void fs_reclaim_tests(void)
+{
+	printk("  --------------------\n");
+	printk("  | fs_reclaim tests |\n");
+	printk("  --------------------\n");
+
+	print_testname("correct nesting");
+	dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
+	pr_cont("\n");
+
+	print_testname("wrong nesting");
+	dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
+	pr_cont("\n");
+
+	print_testname("protected nesting");
+	dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
+	pr_cont("\n");
+}
+
+/* Defines guard classes to create contexts */
+DEFINE_LOCK_GUARD_0(HARDIRQ, HARDIRQ_ENTER(), HARDIRQ_EXIT())
+DEFINE_LOCK_GUARD_0(NOTTHREADED_HARDIRQ,
+	do {
+		local_irq_disable();
+		__irq_enter();
+		WARN_ON(!in_hardirq());
+	} while(0), HARDIRQ_EXIT())
+DEFINE_LOCK_GUARD_0(SOFTIRQ, SOFTIRQ_ENTER(), SOFTIRQ_EXIT())
+
+/* Define RCU guards, should go away when RCU has its own guard definitions */
+DEFINE_LOCK_GUARD_0(RCU, rcu_read_lock(), rcu_read_unlock())
+DEFINE_LOCK_GUARD_0(RCU_BH, rcu_read_lock_bh(), rcu_read_unlock_bh())
+DEFINE_LOCK_GUARD_0(RCU_SCHED, rcu_read_lock_sched(), rcu_read_unlock_sched())
+
+
+#define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock)	\
+										\
+static void __maybe_unused inner##_in_##outer(void)				\
+{										\
+	/* Relies the reversed clean-up ordering: inner first */		\
+	guard(outer)(outer_lock);						\
+	guard(inner)(inner_lock);						\
+}
+
+/*
+ * wait contexts (considering PREEMPT_RT)
+ *
+ * o: inner is allowed in outer
+ * x: inner is disallowed in outer
+ *
+ *       \  inner |  RCU  | RAW_SPIN | SPIN | MUTEX
+ * outer  \       |       |          |      |
+ * ---------------+-------+----------+------+-------
+ * HARDIRQ        |   o   |    o     |  o   |  x
+ * ---------------+-------+----------+------+-------
+ * NOTTHREADED_IRQ|   o   |    o     |  x   |  x
+ * ---------------+-------+----------+------+-------
+ * SOFTIRQ        |   o   |    o     |  o   |  x
+ * ---------------+-------+----------+------+-------
+ * RCU            |   o   |    o     |  o   |  x
+ * ---------------+-------+----------+------+-------
+ * RCU_BH         |   o   |    o     |  o   |  x
+ * ---------------+-------+----------+------+-------
+ * RCU_SCHED      |   o   |    o     |  x   |  x
+ * ---------------+-------+----------+------+-------
+ * RAW_SPIN       |   o   |    o     |  x   |  x
+ * ---------------+-------+----------+------+-------
+ * SPIN           |   o   |    o     |  o   |  x
+ * ---------------+-------+----------+------+-------
+ * MUTEX          |   o   |    o     |  o   |  o
+ * ---------------+-------+----------+------+-------
+ */
+
+#define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock)		\
+GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock)			\
+GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock)		\
+GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock)			\
+GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock)				\
+GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock)			\
+GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock)			\
+GENERATE_2_CONTEXT_TESTCASE(raw_spinlock, &raw_lock_A, inner, inner_lock)	\
+GENERATE_2_CONTEXT_TESTCASE(spinlock, &lock_A, inner, inner_lock)		\
+GENERATE_2_CONTEXT_TESTCASE(mutex, &mutex_A, inner, inner_lock)
+
+GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
+GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(raw_spinlock, &raw_lock_B)
+GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(spinlock, &lock_B)
+GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(mutex, &mutex_B)
+
+/* the outer context allows all kinds of preemption */
+#define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer)			\
+	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
+	dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
+	dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);		\
+	dotest(mutex_in_##outer, SUCCESS, LOCKTYPE_MUTEX);		\
+
+/*
+ * the outer context only allows the preemption introduced by spinlock_t (which
+ * is a sleepable lock for PREEMPT_RT)
+ */
+#define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer)		\
+	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
+	dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
+	dotest(spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);		\
+	dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX);		\
+
+/* the outer doesn't allows any kind of preemption */
+#define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer)			\
+	dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK);		\
+	dotest(raw_spinlock_in_##outer, SUCCESS, LOCKTYPE_SPIN);	\
+	dotest(spinlock_in_##outer, FAILURE, LOCKTYPE_SPIN);		\
+	dotest(mutex_in_##outer, FAILURE, LOCKTYPE_MUTEX);		\
+
+static void wait_context_tests(void)
+{
+	printk("  --------------------------------------------------------------------------\n");
+	printk("  | wait context tests |\n");
+	printk("  --------------------------------------------------------------------------\n");
+	printk("                                 | rcu  | raw  | spin |mutex |\n");
+	printk("  --------------------------------------------------------------------------\n");
+	print_testname("in hardirq context");
+	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
+	pr_cont("\n");
+
+	print_testname("in hardirq context (not threaded)");
+	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
+	pr_cont("\n");
+
+	print_testname("in softirq context");
+	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
+	pr_cont("\n");
+
+	print_testname("in RCU context");
+	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
+	pr_cont("\n");
+
+	print_testname("in RCU-bh context");
+	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
+	pr_cont("\n");
+
+	print_testname("in RCU-sched context");
+	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
+	pr_cont("\n");
+
+	print_testname("in RAW_SPINLOCK context");
+	DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(raw_spinlock);
+	pr_cont("\n");
+
+	print_testname("in SPINLOCK context");
+	DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(spinlock);
+	pr_cont("\n");
+
+	print_testname("in MUTEX context");
+	DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(mutex);
+	pr_cont("\n");
+}
+
+static void local_lock_2(void)
+{
+	local_lock(&local_A);	/* IRQ-ON */
+	local_unlock(&local_A);
+
+	HARDIRQ_ENTER();
+	spin_lock(&lock_A);		/* IN-IRQ */
+	spin_unlock(&lock_A);
+	HARDIRQ_EXIT()
+
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_A);
+	local_lock(&local_A);	/* IN-IRQ <-> IRQ-ON cycle, false */
+	local_unlock(&local_A);
+	spin_unlock(&lock_A);
+	HARDIRQ_ENABLE();
+}
+
+static void local_lock_3A(void)
+{
+	local_lock(&local_A);	/* IRQ-ON */
+	spin_lock(&lock_B);		/* IRQ-ON */
+	spin_unlock(&lock_B);
+	local_unlock(&local_A);
+
+	HARDIRQ_ENTER();
+	spin_lock(&lock_A);		/* IN-IRQ */
+	spin_unlock(&lock_A);
+	HARDIRQ_EXIT()
+
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_A);
+	local_lock(&local_A);	/* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
+	local_unlock(&local_A);
+	spin_unlock(&lock_A);
+	HARDIRQ_ENABLE();
+}
+
+static void local_lock_3B(void)
+{
+	local_lock(&local_A);	/* IRQ-ON */
+	spin_lock(&lock_B);		/* IRQ-ON */
+	spin_unlock(&lock_B);
+	local_unlock(&local_A);
+
+	HARDIRQ_ENTER();
+	spin_lock(&lock_A);		/* IN-IRQ */
+	spin_unlock(&lock_A);
+	HARDIRQ_EXIT()
+
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_A);
+	local_lock(&local_A);	/* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
+	local_unlock(&local_A);
+	spin_unlock(&lock_A);
+	HARDIRQ_ENABLE();
+
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_A);
+	spin_lock(&lock_B);		/* IN-IRQ <-> IRQ-ON cycle, true */
+	spin_unlock(&lock_B);
+	spin_unlock(&lock_A);
+	HARDIRQ_DISABLE();
+
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
+{
+	return rwsem->dep_map.name;
+}
+#else
+static inline const char *rw_semaphore_lockdep_name(struct rw_semaphore *rwsem)
+{
+	return NULL;
+}
+#endif
+
+static void test_lockdep_set_subclass_name(void)
+{
+	const char *name_before = rw_semaphore_lockdep_name(&rwsem_X1);
+	const char *name_after;
+
+	lockdep_set_subclass(&rwsem_X1, 1);
+	name_after = rw_semaphore_lockdep_name(&rwsem_X1);
+	DEBUG_LOCKS_WARN_ON(name_before != name_after);
+}
+
+/*
+ * lockdep_set_subclass() should reuse the existing lock class name instead
+ * of creating a new one.
+ */
+static void lockdep_set_subclass_name_test(void)
+{
+	printk("  --------------------------------------------------------------------------\n");
+	printk("  | lockdep_set_subclass() name test|\n");
+	printk("  -----------------------------------\n");
+
+	print_testname("compare name before and after");
+	dotest(test_lockdep_set_subclass_name, SUCCESS, LOCKTYPE_RWSEM);
+	pr_cont("\n");
+}
+
+static void local_lock_tests(void)
+{
+	printk("  --------------------------------------------------------------------------\n");
+	printk("  | local_lock tests |\n");
+	printk("  ---------------------\n");
+
+	print_testname("local_lock inversion  2");
+	dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
+	pr_cont("\n");
+
+	print_testname("local_lock inversion 3A");
+	dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
+	pr_cont("\n");
+
+	print_testname("local_lock inversion 3B");
+	dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
+	pr_cont("\n");
+}
+
+static void hardirq_deadlock_softirq_not_deadlock(void)
+{
+	/* mutex_A is hardirq-unsafe and softirq-unsafe */
+	/* mutex_A -> lock_C */
+	mutex_lock(&mutex_A);
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_C);
+	spin_unlock(&lock_C);
+	HARDIRQ_ENABLE();
+	mutex_unlock(&mutex_A);
+
+	/* lock_A is hardirq-safe */
+	HARDIRQ_ENTER();
+	spin_lock(&lock_A);
+	spin_unlock(&lock_A);
+	HARDIRQ_EXIT();
+
+	/* lock_A -> lock_B */
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_A);
+	spin_lock(&lock_B);
+	spin_unlock(&lock_B);
+	spin_unlock(&lock_A);
+	HARDIRQ_ENABLE();
+
+	/* lock_B -> lock_C */
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_B);
+	spin_lock(&lock_C);
+	spin_unlock(&lock_C);
+	spin_unlock(&lock_B);
+	HARDIRQ_ENABLE();
+
+	/* lock_D is softirq-safe */
+	SOFTIRQ_ENTER();
+	spin_lock(&lock_D);
+	spin_unlock(&lock_D);
+	SOFTIRQ_EXIT();
+
+	/* And lock_D is hardirq-unsafe */
+	SOFTIRQ_DISABLE();
+	spin_lock(&lock_D);
+	spin_unlock(&lock_D);
+	SOFTIRQ_ENABLE();
+
+	/*
+	 * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
+	 * deadlock.
+	 *
+	 * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
+	 * hardirq-unsafe, deadlock.
+	 */
+	HARDIRQ_DISABLE();
+	spin_lock(&lock_C);
+	spin_lock(&lock_D);
+	spin_unlock(&lock_D);
+	spin_unlock(&lock_C);
+	HARDIRQ_ENABLE();
+}
+
+void locking_selftest(void)
+{
+	/*
+	 * Got a locking failure before the selftest ran?
+	 */
+	if (!debug_locks) {
+		printk("----------------------------------\n");
+		printk("| Locking API testsuite disabled |\n");
+		printk("----------------------------------\n");
+		return;
+	}
+
+	/*
+	 * treats read_lock() as recursive read locks for testing purpose
+	 */
+	force_read_lock_recursive = 1;
+
+	/*
+	 * Run the testsuite:
+	 */
+	printk("------------------------\n");
+	printk("| Locking API testsuite:\n");
+	printk("----------------------------------------------------------------------------\n");
+	printk("                                 | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n");
+	printk("  --------------------------------------------------------------------------\n");
+
+	init_shared_classes();
+	lockdep_set_selftest_task(current);
+
+	DO_TESTCASE_6R("A-A deadlock", AA);
+	DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
+	DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
+	DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
+	DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
+	DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
+	DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
+	DO_TESTCASE_6("double unlock", double_unlock);
+	DO_TESTCASE_6("initialize held", init_held);
+
+	printk("  --------------------------------------------------------------------------\n");
+	print_testname("recursive read-lock");
+	pr_cont("             |");
+	dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
+	pr_cont("\n");
+
+	print_testname("recursive read-lock #2");
+	pr_cont("             |");
+	dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
+	pr_cont("\n");
+
+	print_testname("mixed read-write-lock");
+	pr_cont("             |");
+	dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
+	pr_cont("\n");
+
+	print_testname("mixed write-read-lock");
+	pr_cont("             |");
+	dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
+	pr_cont("\n");
+
+	print_testname("mixed read-lock/lock-write ABBA");
+	pr_cont("             |");
+	dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
+
+	print_testname("mixed read-lock/lock-read ABBA");
+	pr_cont("             |");
+	dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
+
+	print_testname("mixed write-lock/lock-write ABBA");
+	pr_cont("             |");
+	dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
+	pr_cont("             |");
+	dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
+
+	print_testname("chain cached mixed R-L/L-W ABBA");
+	pr_cont("             |");
+	dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
+
+	DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
+	DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
+	DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
+	DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
+
+	printk("  --------------------------------------------------------------------------\n");
+	/*
+	 * irq-context testcases:
+	 */
+	DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
+	NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A));
+	DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
+	DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
+	DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
+	DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
+
+	DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
+	DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
+	DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
+
+	ww_tests();
+
+	force_read_lock_recursive = 0;
+	/*
+	 * queued_read_lock() specific test cases can be put here
+	 */
+	if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
+		queued_read_lock_tests();
+
+	fs_reclaim_tests();
+
+	/* Wait context test cases that are specific for RAW_LOCK_NESTING */
+	if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
+		wait_context_tests();
+
+	local_lock_tests();
+
+	print_testname("hardirq_unsafe_softirq_safe");
+	dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
+	pr_cont("\n");
+
+	lockdep_set_subclass_name_test();
+
+	if (unexpected_testcase_failures) {
+		printk("-----------------------------------------------------------------\n");
+		debug_locks = 0;
+		printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
+			unexpected_testcase_failures, testcase_total);
+		printk("-----------------------------------------------------------------\n");
+	} else if (expected_testcase_failures && testcase_successes) {
+		printk("--------------------------------------------------------\n");
+		printk("%3d out of %3d testcases failed, as expected. |\n",
+			expected_testcase_failures, testcase_total);
+		printk("----------------------------------------------------\n");
+		debug_locks = 1;
+	} else if (expected_testcase_failures && !testcase_successes) {
+		printk("--------------------------------------------------------\n");
+		printk("All %3d testcases failed, as expected. |\n",
+			expected_testcase_failures);
+		printk("----------------------------------------\n");
+		debug_locks = 1;
+	} else {
+		printk("-------------------------------------------------------\n");
+		printk("Good, all %3d testcases passed! |\n",
+			testcase_successes);
+		printk("---------------------------------\n");
+		debug_locks = 1;
+	}
+	lockdep_set_selftest_task(NULL);
+	debug_locks_silent = 0;
+}