Commit 9ecfb2f7287a for kernel

commit 9ecfb2f7287a967b418ba69f10d45ead0d360593
Merge: 23b5d045ae5d 4e8729e6598b
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu Jun 18 21:23:22 2026 -0700

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

    Pull ring-buffer updates from Steven Rostedt

     - Do not invalidate entire buffer for invalid sub-buffers

       For the persistent ring buffer, if one sub-buffer is found to be
       invalid, it invalidates the entire per CPU ring buffer. This can lose
       a lot of valuable data if there's some corruption with the writes to
       the buffer not syncing properly on a hard crash. Instead, if a
       sub-buffer is found to be invalid, simply zero it out and mark it for
       "missed events".

       When the persistent ring buffer is read and a sub-buffer that was
       cleared due to being invalid on boot up is discovered, the output
       will show "[LOST EVENTS]" to let the user know that events were
       missing at that location. Displaying the events from valid buffers
       can still be useful.

     - Add a test to be able to test corrupted sub-buffers

       If a persistent ring buffer is created as "ptraingtest" and the new
       config that adds the test is enabled, when a panic happens, the
       kernel will randomly corrupt one of the per CPU ring buffers. On boot
       up, the sub-buffers with the corruption should be cleared and
       flagged. When reading this buffer, the missed events should should
       [LOST EVENTS].

     - Add commit number in the sub-buffer meta debug info

       The commit is used to know the content of a meta page. Add it to the
       buffer_meta file that is shown for each per CPU buffer.

     - Clean up the persistent ring buffer validation code

       Add some helper functions and make variable names more consistent.

    * tag 'trace-ring-buffer-v7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
      ring-buffer: Better comment the use of RB_MISSED_EVENTS
      ring-buffer: Show persistent buffer dropped events in trace_pipe file
      ring-buffer: Show persistent buffer dropped events in trace file
      ring-buffer: Have dropped subbuffers be persistent across reboots
      ring-buffer: Cleanup buffer_data_page related code
      ring-buffer: Cleanup persistent ring buffer validation
      ring-buffer: Show commit numbers in buffer_meta file
      ring-buffer: Add persistent ring buffer invalid-page inject test
      ring-buffer: Skip invalid sub-buffers when rewinding persistent ring buffer
      ring-buffer: Skip invalid sub-buffers when validating persistent ring buffer