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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-05-16 11:02:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-05-16 11:02:54 -0700 |
| commit | 9d38cd06c3e332093da2c486307395b302e2e31f (patch) | |
| tree | c04652140f30d291a42053104b7673112d8424f8 /include/trace | |
| parent | 21b9f1c7e319f654de3b2574fe8d4e4114c9143f (diff) | |
| parent | 85f4f12d51397f1648e1f4350f77e24039b82d61 (diff) | |
Merge tag 'trace-v4.17-rc5-vsprintf' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull memory barrier for from Steven Rostedt:
"The memory barrier usage in updating the random ptr hash for %p in
vsprintf is incorrect.
Instead of adding the read memory barrier into vsprintf() which will
cause a slight degradation to a commonly used function in the kernel
just to solve a very unlikely race condition that can only happen at
boot up, change the code from using a variable branch to a
static_branch.
Not only does this solve the race condition, it actually will improve
the performance of vsprintf() by removing the conditional branch that
is only needed at boot"
* tag 'trace-v4.17-rc5-vsprintf' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
vsprintf: Replace memory barrier with static_key for random_ptr_key update
Diffstat (limited to 'include/trace')
0 files changed, 0 insertions, 0 deletions