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, 230 insertions, 0 deletions

diff --git a/Documentation/arch/arm/microchip.rst b/Documentation/arch/arm/microchip.rst
new file mode 100644
index 000000000..e721d855f
--- /dev/null
+++ b/Documentation/arch/arm/microchip.rst
@@ -0,0 +1,230 @@
+=============================
+ARM Microchip SoCs (aka AT91)
+=============================
+
+
+Introduction
+------------
+This document gives useful information about the ARM Microchip SoCs that are
+currently supported in Linux Mainline (you know, the one on kernel.org).
+
+It is important to note that the Microchip (previously Atmel) ARM-based MPU
+product line is historically named "AT91" or "at91" throughout the Linux kernel
+development process even if this product prefix has completely disappeared from
+the official Microchip product name. Anyway, files, directories, git trees,
+git branches/tags and email subject always contain this "at91" sub-string.
+
+
+AT91 SoCs
+---------
+Documentation and detailed datasheet for each product are available on
+the Microchip website: http://www.microchip.com.
+
+  Flavors:
+    * ARM 920 based SoC
+      - at91rm9200
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-1768-32-bit-ARM920T-Embedded-Microprocessor-AT91RM9200_Datasheet.pdf
+
+    * ARM 926 based SoCs
+      - at91sam9260
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6221-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9260_Datasheet.pdf
+
+      - at91sam9xe
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6254-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9XE_Datasheet.pdf
+
+      - at91sam9261
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6062-ARM926EJ-S-Microprocessor-SAM9261_Datasheet.pdf
+
+      - at91sam9263
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6249-32-bit-ARM926EJ-S-Embedded-Microprocessor-SAM9263_Datasheet.pdf
+
+      - at91sam9rl
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/doc6289.pdf
+
+      - at91sam9g20
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001516A.pdf
+
+      - at91sam9g45 family
+        - at91sam9g45
+        - at91sam9g46
+        - at91sam9m10
+        - at91sam9m11 (device superset)
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-6437-32-bit-ARM926-Embedded-Microprocessor-SAM9M11_Datasheet.pdf
+
+      - at91sam9x5 family (aka "The 5 series")
+        - at91sam9g15
+        - at91sam9g25
+        - at91sam9g35
+        - at91sam9x25
+        - at91sam9x35
+
+          * Datasheet (can be considered as covering the whole family)
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11055-32-bit-ARM926EJ-S-Microcontroller-SAM9X35_Datasheet.pdf
+
+      - at91sam9n12
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001517A.pdf
+
+      - sam9x60
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/SAM9X60-Data-Sheet-DS60001579A.pdf
+
+    * ARM Cortex-A5 based SoCs
+      - sama5d3 family
+
+        - sama5d31
+        - sama5d33
+        - sama5d34
+        - sama5d35
+        - sama5d36 (device superset)
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet_B.pdf
+
+    * ARM Cortex-A5 + NEON based SoCs
+      - sama5d4 family
+
+        - sama5d41
+        - sama5d42
+        - sama5d43
+        - sama5d44 (device superset)
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/60001525A.pdf
+
+      - sama5d2 family
+
+        - sama5d21
+        - sama5d22
+        - sama5d23
+        - sama5d24
+        - sama5d26
+        - sama5d27 (device superset)
+        - sama5d28 (device superset + environmental monitors)
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001476B.pdf
+
+    * ARM Cortex-A7 based SoCs
+      - sama7g5 family
+
+        - sama7g51
+        - sama7g52
+        - sama7g53
+        - sama7g54 (device superset)
+
+          * Datasheet
+
+          Coming soon
+
+      - lan966 family
+        - lan9662
+        - lan9668
+
+          * Datasheet
+
+          Coming soon
+
+    * ARM Cortex-M7 MCUs
+      - sams70 family
+
+        - sams70j19
+        - sams70j20
+        - sams70j21
+        - sams70n19
+        - sams70n20
+        - sams70n21
+        - sams70q19
+        - sams70q20
+        - sams70q21
+
+      - samv70 family
+
+        - samv70j19
+        - samv70j20
+        - samv70n19
+        - samv70n20
+        - samv70q19
+        - samv70q20
+
+      - samv71 family
+
+        - samv71j19
+        - samv71j20
+        - samv71j21
+        - samv71n19
+        - samv71n20
+        - samv71n21
+        - samv71q19
+        - samv71q20
+        - samv71q21
+
+          * Datasheet
+
+          http://ww1.microchip.com/downloads/en/DeviceDoc/SAM-E70-S70-V70-V71-Family-Data-Sheet-DS60001527D.pdf
+
+
+Linux kernel information
+------------------------
+Linux kernel mach directory: arch/arm/mach-at91
+MAINTAINERS entry is: "ARM/Microchip (AT91) SoC support"
+
+
+Device Tree for AT91 SoCs and boards
+------------------------------------
+All AT91 SoCs are converted to Device Tree. Since Linux 3.19, these products
+must use this method to boot the Linux kernel.
+
+Work In Progress statement:
+Device Tree files and Device Tree bindings that apply to AT91 SoCs and boards are
+considered as "Unstable". To be completely clear, any at91 binding can change at
+any time. So, be sure to use a Device Tree Binary and a Kernel Image generated from
+the same source tree.
+Please refer to the Documentation/devicetree/bindings/ABI.rst file for a
+definition of a "Stable" binding/ABI.
+This statement will be removed by AT91 MAINTAINERS when appropriate.
+
+Naming conventions and best practice:
+
+- SoCs Device Tree Source Include files are named after the official name of
+  the product (at91sam9g20.dtsi or sama5d33.dtsi for instance).
+- Device Tree Source Include files (.dtsi) are used to collect common nodes that can be
+  shared across SoCs or boards (sama5d3.dtsi or at91sam9x5cm.dtsi for instance).
+  When collecting nodes for a particular peripheral or topic, the identifier have to
+  be placed at the end of the file name, separated with a "_" (at91sam9x5_can.dtsi
+  or sama5d3_gmac.dtsi for example).
+- board Device Tree Source files (.dts) are prefixed by the string "at91-" so
+  that they can be identified easily. Note that some files are historical exceptions
+  to this rule (sama5d3[13456]ek.dts, usb_a9g20.dts or animeo_ip.dts for example).