tree 96be78d1031669a54dcd5e9d82a5c1574f47ef74
parent 8630c59e99363c4b655788fd01134aef9bcd9264
parent 549e914c96ae67760f36b9714b424dc992a0a69b
author Linus Torvalds <torvalds@linux-foundation.org> 1749395941 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1749395941 -0700
mergetag object 549e914c96ae67760f36b9714b424dc992a0a69b
 type commit
 tag trace-v6.16-3
 tagger Steven Rostedt (Google) <rostedt@goodmis.org> 1749324648 -0400
 
 tracing fixes:
 
 - Fix regression of waiting a long time on updating trace event filters
 
   When the faultable trace points were added, it needed task trace RCU
   synchronization. This was added to the tracepoint_synchronize_unregister()
   function. The filter logic always called this function whenever it
   updated the trace event filters before freeing the old filters.
   This increased the time of "trace-cmd record" from taking 13 seconds
   to running over 2 minutes to complete.
 
   Move the freeing of the filters to call_rcu*() logic, which brings the
   time back down to 13 seconds.
 
 - Fix ring_buffer_subbuf_order_set() error path lock protection
 
   The error path of the ring_buffer_subbuf_order_set() released the
   mutex too early and allowed subsequent accesses to setting the
   subbuffer size to corrupt the data and cause a bug.
 
   By moving the mutex locking to the end of the error path, it prevents
   the reentrant access to the critical data and also allows the function
   to convert the taking of the mutex over to the guard() logic.
 
 - Remove unused power management clock events
 
   The clock events were added in 2010 for power management. In 2011
   arm used them. In 2013 the code they were used in was removed.
   These events have been wasting memory since then.
 
 - Fix sparse warnings
 
   There was a few places that sparse warned about trace_events_filter.c
   where file->filter was referenced directly, but it is annotated with
   an __rcu tag. Use the helper functions and fix them up to use
   rcu_dereference() properly.
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Merge tag 'trace-v6.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull more tracing fixes from Steven Rostedt:

 - Fix regression of waiting a long time on updating trace event filters

   When the faultable trace points were added, it needed task trace RCU
   synchronization.

   This was added to the tracepoint_synchronize_unregister() function.
   The filter logic always called this function whenever it updated the
   trace event filters before freeing the old filters. This increased
   the time of "trace-cmd record" from taking 13 seconds to running over
   2 minutes to complete.

   Move the freeing of the filters to call_rcu*() logic, which brings
   the time back down to 13 seconds.

 - Fix ring_buffer_subbuf_order_set() error path lock protection

   The error path of the ring_buffer_subbuf_order_set() released the
   mutex too early and allowed subsequent accesses to setting the
   subbuffer size to corrupt the data and cause a bug.

   By moving the mutex locking to the end of the error path, it prevents
   the reentrant access to the critical data and also allows the
   function to convert the taking of the mutex over to the guard()
   logic.

 - Remove unused power management clock events

   The clock events were added in 2010 for power management. In 2011 arm
   used them. In 2013 the code they were used in was removed. These
   events have been wasting memory since then.

 - Fix sparse warnings

   There was a few places that sparse warned about trace_events_filter.c
   where file->filter was referenced directly, but it is annotated with
   an __rcu tag. Use the helper functions and fix them up to use
   rcu_dereference() properly.

* tag 'trace-v6.16-3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing: Add rcu annotation around file->filter accesses
  tracing: PM: Remove unused clock events
  ring-buffer: Fix buffer locking in ring_buffer_subbuf_order_set()
  tracing: Fix regression of filter waiting a long time on RCU synchronization