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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-10-27 17:15:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-10-27 17:15:49 -0700 |
| commit | 02c7dfc006a6e3f4a169f98b8f6c5703756d0072 (patch) | |
| tree | b1a092562fc33304e1e798b7fef5c75b48a39b59 | |
| parent | 5cefb4ee245cb28a3920dbd0edc9d6df1f72a8cf (diff) | |
| parent | 2eece390bf68ec8f733d7e4a3ba8a5ea350082ae (diff) | |
| download | linux-02c7dfc006a6e3f4a169f98b8f6c5703756d0072.tar.gz | |
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fix from Ingo Molnar:
"A fix for a misplaced permission check that can leave perf PT or LBR
disabled (on Intel CPUs) permanently until the next reboot"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel/bts: Fix exclusive event reference leak
| -rw-r--r-- | arch/x86/events/intel/bts.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c index 16076eb3469969..141e07b0621689 100644 --- a/arch/x86/events/intel/bts.c +++ b/arch/x86/events/intel/bts.c @@ -546,9 +546,6 @@ static int bts_event_init(struct perf_event *event) if (event->attr.type != bts_pmu.type) return -ENOENT; - if (x86_add_exclusive(x86_lbr_exclusive_bts)) - return -EBUSY; - /* * BTS leaks kernel addresses even when CPL0 tracing is * disabled, so disallow intel_bts driver for unprivileged @@ -562,6 +559,9 @@ static int bts_event_init(struct perf_event *event) !capable(CAP_SYS_ADMIN)) return -EACCES; + if (x86_add_exclusive(x86_lbr_exclusive_bts)) + return -EBUSY; + ret = x86_reserve_hardware(); if (ret) { x86_del_exclusive(x86_lbr_exclusive_bts); |