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, 149 insertions, 0 deletions

diff --git a/include/dt-bindings/clock/r9a06g032-sysctrl.h b/include/dt-bindings/clock/r9a06g032-sysctrl.h
new file mode 100644
index 000000000..d9d7b8b4f
--- /dev/null
+++ b/include/dt-bindings/clock/r9a06g032-sysctrl.h
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * R9A06G032 sysctrl IDs
+ *
+ * Copyright (C) 2018 Renesas Electronics Europe Limited
+ *
+ * Michel Pollet <michel.pollet@bp.renesas.com>, <buserror@gmail.com>
+ */
+
+#ifndef __DT_BINDINGS_R9A06G032_SYSCTRL_H__
+#define __DT_BINDINGS_R9A06G032_SYSCTRL_H__
+
+#define R9A06G032_CLK_PLL_USB		1
+#define R9A06G032_CLK_48		1	/* AKA CLK_PLL_USB */
+#define R9A06G032_MSEBIS_CLK		3	/* AKA CLKOUT_D16 */
+#define R9A06G032_MSEBIM_CLK		3	/* AKA CLKOUT_D16 */
+#define R9A06G032_CLK_DDRPHY_PLLCLK	5	/* AKA CLKOUT_D1OR2 */
+#define R9A06G032_CLK50			6	/* AKA CLKOUT_D20 */
+#define R9A06G032_CLK25			7	/* AKA CLKOUT_D40 */
+#define R9A06G032_CLK125		9	/* AKA CLKOUT_D8 */
+#define R9A06G032_CLK_P5_PG1		17	/* AKA DIV_P5_PG */
+#define R9A06G032_CLK_REF_SYNC		21	/* AKA DIV_REF_SYNC */
+#define R9A06G032_CLK_25_PG4		26
+#define R9A06G032_CLK_25_PG5		27
+#define R9A06G032_CLK_25_PG6		28
+#define R9A06G032_CLK_25_PG7		29
+#define R9A06G032_CLK_25_PG8		30
+#define R9A06G032_CLK_ADC		31
+#define R9A06G032_CLK_ECAT100		32
+#define R9A06G032_CLK_HSR100		33
+#define R9A06G032_CLK_I2C0		34
+#define R9A06G032_CLK_I2C1		35
+#define R9A06G032_CLK_MII_REF		36
+#define R9A06G032_CLK_NAND		37
+#define R9A06G032_CLK_NOUSBP2_PG6	38
+#define R9A06G032_CLK_P1_PG2		39
+#define R9A06G032_CLK_P1_PG3		40
+#define R9A06G032_CLK_P1_PG4		41
+#define R9A06G032_CLK_P4_PG3		42
+#define R9A06G032_CLK_P4_PG4		43
+#define R9A06G032_CLK_P6_PG1		44
+#define R9A06G032_CLK_P6_PG2		45
+#define R9A06G032_CLK_P6_PG3		46
+#define R9A06G032_CLK_P6_PG4		47
+#define R9A06G032_CLK_PCI_USB		48
+#define R9A06G032_CLK_QSPI0		49
+#define R9A06G032_CLK_QSPI1		50
+#define R9A06G032_CLK_RGMII_REF		51
+#define R9A06G032_CLK_RMII_REF		52
+#define R9A06G032_CLK_SDIO0		53
+#define R9A06G032_CLK_SDIO1		54
+#define R9A06G032_CLK_SERCOS100		55
+#define R9A06G032_CLK_SLCD		56
+#define R9A06G032_CLK_SPI0		57
+#define R9A06G032_CLK_SPI1		58
+#define R9A06G032_CLK_SPI2		59
+#define R9A06G032_CLK_SPI3		60
+#define R9A06G032_CLK_SPI4		61
+#define R9A06G032_CLK_SPI5		62
+#define R9A06G032_CLK_SWITCH		63
+#define R9A06G032_HCLK_ECAT125		65
+#define R9A06G032_HCLK_PINCONFIG	66
+#define R9A06G032_HCLK_SERCOS		67
+#define R9A06G032_HCLK_SGPIO2		68
+#define R9A06G032_HCLK_SGPIO3		69
+#define R9A06G032_HCLK_SGPIO4		70
+#define R9A06G032_HCLK_TIMER0		71
+#define R9A06G032_HCLK_TIMER1		72
+#define R9A06G032_HCLK_USBF		73
+#define R9A06G032_HCLK_USBH		74
+#define R9A06G032_HCLK_USBPM		75
+#define R9A06G032_CLK_48_PG_F		76
+#define R9A06G032_CLK_48_PG4		77
+#define R9A06G032_CLK_DDRPHY_PCLK	81	/* AKA CLK_REF_SYNC_D4 */
+#define R9A06G032_CLK_FW		81	/* AKA CLK_REF_SYNC_D4 */
+#define R9A06G032_CLK_CRYPTO		81	/* AKA CLK_REF_SYNC_D4 */
+#define R9A06G032_CLK_WATCHDOG		82	/* AKA CLK_REF_SYNC_D8 */
+#define R9A06G032_CLK_A7MP		84	/* AKA DIV_CA7 */
+#define R9A06G032_HCLK_CAN0		85
+#define R9A06G032_HCLK_CAN1		86
+#define R9A06G032_HCLK_DELTASIGMA	87
+#define R9A06G032_HCLK_PWMPTO		88
+#define R9A06G032_HCLK_RSV		89
+#define R9A06G032_HCLK_SGPIO0		90
+#define R9A06G032_HCLK_SGPIO1		91
+#define R9A06G032_RTOS_MDC		92
+#define R9A06G032_CLK_CM3		93
+#define R9A06G032_CLK_DDRC		94
+#define R9A06G032_CLK_ECAT25		95
+#define R9A06G032_CLK_HSR50		96
+#define R9A06G032_CLK_HW_RTOS		97
+#define R9A06G032_CLK_SERCOS50		98
+#define R9A06G032_HCLK_ADC		99
+#define R9A06G032_HCLK_CM3		100
+#define R9A06G032_HCLK_CRYPTO_EIP150	101
+#define R9A06G032_HCLK_CRYPTO_EIP93	102
+#define R9A06G032_HCLK_DDRC		103
+#define R9A06G032_HCLK_DMA0		104
+#define R9A06G032_HCLK_DMA1		105
+#define R9A06G032_HCLK_GMAC0		106
+#define R9A06G032_HCLK_GMAC1		107
+#define R9A06G032_HCLK_GPIO0		108
+#define R9A06G032_HCLK_GPIO1		109
+#define R9A06G032_HCLK_GPIO2		110
+#define R9A06G032_HCLK_HSR		111
+#define R9A06G032_HCLK_I2C0		112
+#define R9A06G032_HCLK_I2C1		113
+#define R9A06G032_HCLK_LCD		114
+#define R9A06G032_HCLK_MSEBI_M		115
+#define R9A06G032_HCLK_MSEBI_S		116
+#define R9A06G032_HCLK_NAND		117
+#define R9A06G032_HCLK_PG_I		118
+#define R9A06G032_HCLK_PG19		119
+#define R9A06G032_HCLK_PG20		120
+#define R9A06G032_HCLK_PG3		121
+#define R9A06G032_HCLK_PG4		122
+#define R9A06G032_HCLK_QSPI0		123
+#define R9A06G032_HCLK_QSPI1		124
+#define R9A06G032_HCLK_ROM		125
+#define R9A06G032_HCLK_RTC		126
+#define R9A06G032_HCLK_SDIO0		127
+#define R9A06G032_HCLK_SDIO1		128
+#define R9A06G032_HCLK_SEMAP		129
+#define R9A06G032_HCLK_SPI0		130
+#define R9A06G032_HCLK_SPI1		131
+#define R9A06G032_HCLK_SPI2		132
+#define R9A06G032_HCLK_SPI3		133
+#define R9A06G032_HCLK_SPI4		134
+#define R9A06G032_HCLK_SPI5		135
+#define R9A06G032_HCLK_SWITCH		136
+#define R9A06G032_HCLK_SWITCH_RG	137
+#define R9A06G032_HCLK_UART0		138
+#define R9A06G032_HCLK_UART1		139
+#define R9A06G032_HCLK_UART2		140
+#define R9A06G032_HCLK_UART3		141
+#define R9A06G032_HCLK_UART4		142
+#define R9A06G032_HCLK_UART5		143
+#define R9A06G032_HCLK_UART6		144
+#define R9A06G032_HCLK_UART7		145
+#define R9A06G032_CLK_UART0		146
+#define R9A06G032_CLK_UART1		147
+#define R9A06G032_CLK_UART2		148
+#define R9A06G032_CLK_UART3		149
+#define R9A06G032_CLK_UART4		150
+#define R9A06G032_CLK_UART5		151
+#define R9A06G032_CLK_UART6		152
+#define R9A06G032_CLK_UART7		153
+
+#endif /* __DT_BINDINGS_R9A06G032_SYSCTRL_H__ */