Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 388 insertions, 0 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
new file mode 100644
index 000000000..d3afac2f0
--- /dev/null
+++ b/arch/parisc/Kconfig
@@ -0,0 +1,388 @@
+# SPDX-License-Identifier: GPL-2.0
+config PARISC
+	def_bool y
+	select ALTERNATE_USER_ADDRESS_SPACE
+	select ARCH_32BIT_OFF_T if !64BIT
+	select ARCH_MIGHT_HAVE_PC_PARPORT
+	select HAVE_FUNCTION_TRACER
+	select HAVE_FUNCTION_GRAPH_TRACER
+	select HAVE_SYSCALL_TRACEPOINTS
+	select ARCH_WANT_FRAME_POINTERS
+	select ARCH_WANTS_MODULES_TEXT_SECTIONS if !64BIT
+	select ARCH_HAS_CPU_CACHE_ALIASING
+	select ARCH_HAS_DMA_ALLOC if PA11
+	select ARCH_HAS_DMA_OPS
+	select ARCH_HAS_ELF_RANDOMIZE
+	select ARCH_HAS_STRICT_KERNEL_RWX
+	select ARCH_HAS_STRICT_MODULE_RWX
+	select ARCH_HAS_UBSAN
+	select ARCH_HAS_PTE_SPECIAL
+	select ARCH_NO_SG_CHAIN
+	select ARCH_SPLIT_ARG64 if !64BIT
+	select ARCH_SUPPORTS_HUGETLBFS if PA20
+	select ARCH_SUPPORTS_MEMORY_FAILURE
+	select ARCH_STACKWALK
+	select ARCH_HAS_CACHE_LINE_SIZE
+	select ARCH_HAS_DEBUG_VM_PGTABLE
+	select HAVE_RELIABLE_STACKTRACE
+	select RTC_CLASS
+	select RTC_DRV_GENERIC
+	select INIT_ALL_POSSIBLE
+	select BUG
+	select HAVE_KERNEL_UNCOMPRESSED
+	select HAVE_PCI
+	select HAVE_PERF_EVENTS
+	select HAVE_PERF_REGS
+	select HAVE_PERF_USER_STACK_DUMP
+	select PERF_USE_VMALLOC
+	select HAVE_KERNEL_BZIP2
+	select HAVE_KERNEL_GZIP
+	select HAVE_KERNEL_LZ4
+	select HAVE_KERNEL_LZMA
+	select HAVE_KERNEL_LZO
+	select HAVE_KERNEL_XZ
+	select GENERIC_ATOMIC64 if !64BIT
+	select GENERIC_IRQ_PROBE
+	select GENERIC_PCI_IOMAP
+	select GENERIC_IOREMAP
+	select ARCH_HAVE_NMI_SAFE_CMPXCHG
+	select GENERIC_SMP_IDLE_THREAD
+	select GENERIC_ARCH_TOPOLOGY if SMP
+	select ARCH_SUPPORTS_SCHED_MC if SMP && PA8X00
+	select GENERIC_CPU_DEVICES if !SMP
+	select GENERIC_LIB_DEVMEM_IS_ALLOWED
+	select SYSCTL_ARCH_UNALIGN_ALLOW
+	select SYSCTL_ARCH_UNALIGN_NO_WARN
+	select SYSCTL_EXCEPTION_TRACE
+	select HAVE_MOD_ARCH_SPECIFIC
+	select MODULES_USE_ELF_RELA
+	select CLONE_BACKWARDS
+	select TTY # Needed for pdc_cons.c
+	select HAS_IOPORT if PCI || EISA
+	select HAVE_DEBUG_STACKOVERFLOW
+	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
+	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
+	select HAVE_ARCH_MMAP_RND_BITS
+	select HAVE_ARCH_AUDITSYSCALL
+	select HAVE_ARCH_HASH
+	# select HAVE_ARCH_JUMP_LABEL
+	# select HAVE_ARCH_JUMP_LABEL_RELATIVE
+	select HAVE_ARCH_KFENCE
+	select HAVE_ARCH_SECCOMP_FILTER
+	select HAVE_ARCH_TRACEHOOK
+	select HAVE_EBPF_JIT
+	select ARCH_WANT_DEFAULT_BPF_JIT
+	select HAVE_REGS_AND_STACK_ACCESS_API
+	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
+	select GENERIC_SCHED_CLOCK
+	select GENERIC_IRQ_MIGRATION if SMP
+	select HAVE_UNSTABLE_SCHED_CLOCK if SMP
+	select GENERIC_CLOCKEVENTS
+	select CPU_NO_EFFICIENT_FFS
+	select THREAD_INFO_IN_TASK
+	select MMU_GATHER_RCU_TABLE_FREE
+	select NEED_DMA_MAP_STATE
+	select NEED_SG_DMA_LENGTH
+	select HAVE_ARCH_KGDB
+	select HAVE_KPROBES
+	select HAVE_KRETPROBES
+	select HAVE_DYNAMIC_FTRACE if $(cc-option,-fpatchable-function-entry=1,1)
+	select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE
+	select HAVE_KPROBES_ON_FTRACE
+	select HAVE_DYNAMIC_FTRACE_WITH_REGS
+	select HAVE_SOFTIRQ_ON_OWN_STACK if IRQSTACKS
+	select TRACE_IRQFLAGS_SUPPORT
+	select HAVE_FUNCTION_DESCRIPTORS if 64BIT
+	select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
+
+	help
+	  The PA-RISC microprocessor is designed by Hewlett-Packard and used
+	  in many of their workstations & servers (HP9000 700 and 800 series,
+	  and later HP3000 series).  The PA-RISC Linux project home page is
+	  at <https://parisc.wiki.kernel.org>.
+
+config CPU_BIG_ENDIAN
+	def_bool y
+
+config MMU
+	def_bool y
+
+config STACK_GROWSUP
+	def_bool y
+
+config GENERIC_LOCKBREAK
+	bool
+	default y
+	depends on SMP && PREEMPTION
+
+config ARCH_HAS_ILOG2_U32
+	bool
+	default n
+
+config ARCH_HAS_ILOG2_U64
+	bool
+	default n
+
+config GENERIC_BUG
+	def_bool y
+	depends on BUG
+	select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
+
+config GENERIC_BUG_RELATIVE_POINTERS
+	bool
+
+config GENERIC_CSUM
+	def_bool y
+
+config GENERIC_HWEIGHT
+	bool
+	default y
+
+config GENERIC_CALIBRATE_DELAY
+	bool
+	default y
+
+config TIME_LOW_RES
+	bool
+	depends on SMP
+	default y
+
+config ARCH_MMAP_RND_BITS_MIN
+	default 18 if 64BIT
+	default 8
+
+config ARCH_MMAP_RND_COMPAT_BITS_MIN
+	default 8
+
+config ARCH_MMAP_RND_BITS_MAX
+	default 18 if 64BIT
+	default 13
+
+config ARCH_MMAP_RND_COMPAT_BITS_MAX
+	default 13
+
+# unless you want to implement ACPI on PA-RISC ... ;-)
+config PM
+	bool
+
+config STACKTRACE_SUPPORT
+	def_bool y
+
+config LOCKDEP_SUPPORT
+	bool
+	default y
+
+config ISA_DMA_API
+	bool
+
+config ARCH_MAY_HAVE_PC_FDC
+	bool
+	depends on BROKEN
+	default y
+
+config PGTABLE_LEVELS
+	int
+	default 3 if 64BIT && PARISC_PAGE_SIZE_4KB
+	default 2
+
+menu "Processor type and features"
+
+choice
+	prompt "Processor type"
+	default PA7000 if "$(ARCH)" = "parisc"
+
+config PA7000
+	bool "PA7000/PA7100" if "$(ARCH)" = "parisc"
+	help
+	  This is the processor type of your CPU.  This information is
+	  used for optimizing purposes.  In order to compile a kernel
+	  that can run on all 32-bit PA CPUs (albeit not optimally fast),
+	  you can specify "PA7000" here.
+
+	  Specifying "PA8000" here will allow you to select a 64-bit kernel
+	  which is required on some machines.
+
+config PA7100LC
+	bool "PA7100LC" if "$(ARCH)" = "parisc"
+	help
+	  Select this option for the PCX-L processor, as used in the
+	  712, 715/64, 715/80, 715/100, 715/100XC, 725/100, 743, 748,
+	  D200, D210, D300, D310 and E-class
+
+config PA7200
+	bool "PA7200" if "$(ARCH)" = "parisc"
+	help
+	  Select this option for the PCX-T' processor, as used in the
+	  C100, C110, J100, J110, J210XC, D250, D260, D350, D360,
+	  K100, K200, K210, K220, K400, K410 and K420
+
+config PA7300LC
+	bool "PA7300LC" if "$(ARCH)" = "parisc"
+	help
+	  Select this option for the PCX-L2 processor, as used in the
+	  744, A180, B132L, B160L, B180L, C132L, C160L, C180L,
+	  D220, D230, D320 and D330.
+
+config PA8X00
+	bool "PA8000 and up"
+	help
+	  Select this option for PCX-U to PCX-W2 processors.
+
+endchoice
+
+# Define implied options from the CPU selection here
+
+config PA20
+	def_bool y
+	depends on PA8X00
+
+config PA11
+	def_bool y
+	depends on PA7000 || PA7100LC || PA7200 || PA7300LC
+	select ARCH_HAS_SYNC_DMA_FOR_CPU
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+
+config PREFETCH
+	def_bool y
+	depends on PA8X00 || PA7200
+
+config PARISC_HUGE_KERNEL
+	def_bool y if !MODULES || UBSAN || FTRACE || COMPILE_TEST
+
+config MLONGCALLS
+	bool "Enable the -mlong-calls compiler option for big kernels" if !PARISC_HUGE_KERNEL
+	depends on PA8X00
+	default PARISC_HUGE_KERNEL
+	help
+	  If you configure the kernel to include many drivers built-in instead
+	  as modules, the kernel executable may become too big, so that the
+	  linker will not be able to resolve some long branches and fails to link
+	  your vmlinux kernel. In that case enabling this option will help you
+	  to overcome this limit by using the -mlong-calls compiler option.
+
+	  Usually you want to say N here, unless you e.g. want to build
+	  a kernel which includes all necessary drivers built-in and which can
+	  be used for TFTP booting without the need to have an initrd ramdisk.
+
+	  Enabling this option will probably slow down your kernel.
+
+config 64BIT
+	bool "64-bit kernel" if "$(ARCH)" = "parisc"
+	depends on PA8X00
+	default "$(ARCH)" = "parisc64"
+	help
+	  Enable this if you want to support 64bit kernel on PA-RISC platform.
+
+	  At the moment, only people willing to use more than 2GB of RAM,
+	  or having a 64bit-only capable PA-RISC machine should say Y here.
+
+	  Since there is no 64bit userland on PA-RISC, there is no point to
+	  enable this option otherwise. The 64bit kernel is significantly bigger
+	  and slower than the 32bit one.
+
+choice
+	prompt "Kernel page size"
+	default PARISC_PAGE_SIZE_4KB
+
+config PARISC_PAGE_SIZE_4KB
+	bool "4KB"
+	select HAVE_PAGE_SIZE_4KB
+	help
+	  This lets you select the page size of the kernel.  For best
+	  performance, a page size of 16KB is recommended.  For best
+	  compatibility with 32bit applications, a page size of 4KB should be
+	  selected (the vast majority of 32bit binaries work perfectly fine
+	  with a larger page size).
+
+	  4KB                For best 32bit compatibility
+	  16KB               For best performance
+	  64KB               For best performance, might give more overhead.
+
+	  If you don't know what to do, choose 4KB.
+
+config PARISC_PAGE_SIZE_16KB
+	bool "16KB"
+	select HAVE_PAGE_SIZE_16KB
+	depends on PA8X00 && BROKEN && !KFENCE
+
+config PARISC_PAGE_SIZE_64KB
+	bool "64KB"
+	select HAVE_PAGE_SIZE_64KB
+	depends on PA8X00 && BROKEN && !KFENCE
+
+endchoice
+
+config SMP
+	bool "Symmetric multi-processing support"
+	help
+	  This enables support for systems with more than one CPU. If you have
+	  a system with only one CPU, say N. If you have a system with more
+	  than one CPU, say Y.
+
+	  If you say N here, the kernel will run on uni- and multiprocessor
+	  machines, but will use only one CPU of a multiprocessor machine.
+	  On a uniprocessor machine, the kernel will run faster if you say N.
+
+	  See also <file:Documentation/admin-guide/lockup-watchdogs.rst> and the SMP-HOWTO
+	  available at <https://www.tldp.org/docs.html#howto>.
+
+	  If you don't know what to do here, say N.
+
+config IRQSTACKS
+	bool "Use separate kernel stacks when processing interrupts"
+	default y
+	help
+	  If you say Y here the kernel will use separate kernel stacks
+	  for handling hard and soft interrupts.  This can help avoid
+	  overflowing the process kernel stacks.
+
+config HOTPLUG_CPU
+	bool
+	default y if SMP
+
+config ARCH_SELECT_MEMORY_MODEL
+	def_bool y
+	depends on 64BIT
+
+config ARCH_SPARSEMEM_ENABLE
+	def_bool y
+	depends on 64BIT
+
+config ARCH_FLATMEM_ENABLE
+	def_bool y
+
+config ARCH_SPARSEMEM_DEFAULT
+	def_bool y
+	depends on ARCH_SPARSEMEM_ENABLE
+
+source "kernel/Kconfig.hz"
+
+config COMPAT
+	bool "Kernel support for 32-bit binaries"
+	default 64BIT
+	depends on 64BIT
+
+config AUDIT_ARCH
+	def_bool y
+
+config NR_CPUS
+	int "Maximum number of CPUs (2-32)"
+	range 2 32
+	depends on SMP
+	default "8" if 64BIT
+	default "16"
+
+endmenu
+
+config ARCH_SUPPORTS_KEXEC
+	def_bool y
+
+config ARCH_SUPPORTS_KEXEC_FILE
+	def_bool y
+
+config ARCH_SELECTS_KEXEC_FILE
+	def_bool y
+	depends on KEXEC_FILE
+	select KEXEC_ELF
+
+source "drivers/parisc/Kconfig"