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This includes two fixes

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- Bring back context level recursive protection in ring buffer.
    The simpler counter protection failed, due to a path when
    tracing with trace_clock_global() as it could not be reentrant
    and depended on the ring buffer recursive protection to keep that
    from happening.
 
  - Prevent branch profiling when FORTIFY_SOURCE is enabled. It causes
    50 - 60 MB in warning messages. Branch profiling should never be
    run on production systems, so there's no reason that it needs to
    be enabled with FORTIFY_SOURCE.
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Merge tag 'trace-v4.15-rc4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:

 - Bring back context level recursive protection in ring buffer.

   The simpler counter protection failed, due to a path when tracing
   with trace_clock_global() as it could not be reentrant and depended
   on the ring buffer recursive protection to keep that from happening.

 - Prevent branch profiling when FORTIFY_SOURCE is enabled.

   It causes 50 - 60 MB in warning messages. Branch profiling should
   never be run on production systems, so there's no reason that it
   needs to be enabled with FORTIFY_SOURCE.

* tag 'trace-v4.15-rc4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Prevent PROFILE_ALL_BRANCHES when FORTIFY_SOURCE=y
  ring-buffer: Bring back context level recursive checks
This commit is contained in:
Linus Torvalds 2018-01-16 12:09:36 -08:00
commit 921d4f67bf
2 changed files with 46 additions and 18 deletions
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