diff options
| author | Alexander Shishkin <[email protected]> | 2016-09-06 16:23:51 +0300 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2016-09-10 11:15:37 +0200 |
| commit | a9a94401c2b5805c71e39427b1af1bf1b9f67cd0 (patch) | |
| tree | 07395919ca53f90bd7d2c82abd2a6b9e903678bd /net/unix/sysctl_net_unix.c | |
| parent | b79ccadd6bb10e72cf784a298ca6dc1398eb9a24 (diff) | |
perf/x86/intel/bts: Fix confused ordering of PMU callbacks
The intel_bts driver is using a CPU-local 'started' variable to order
callbacks and PMIs and make sure that AUX transactions don't get messed
up. However, the ordering rules in regard to this variable is a complete
mess, which recently resulted in perf_fuzzer-triggered warnings and
panics.
The general ordering rule that is patch is enforcing is that this
cpu-local variable be set only when the cpu-local AUX transaction is
active; consequently, this variable is to be checked before the AUX
related bits can be touched.
Reported-by: Vince Weaver <[email protected]>
Signed-off-by: Alexander Shishkin <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'net/unix/sysctl_net_unix.c')
0 files changed, 0 insertions, 0 deletions