path: root/arch/x86/kernel/cpu/perf_event.c
diff options
authorLinus Torvalds <>2014-07-27 09:57:16 -0700
committerLinus Torvalds <>2014-07-27 09:57:16 -0700
commit9dae0a3fc4b0b9aed302a0fad61846c49cc313b1 (patch)
tree7ef2c3a50f8c340762fe45102d90cf41bdf27170 /arch/x86/kernel/cpu/perf_event.c
parent43a255c210cebdf09235567bf46d3ceea3438b4f (diff)
parentd81b4253b0f0f1e7b7e03b0cd0f80cab18bc4d7b (diff)
Merge branch 'perf-urgent-for-linus' of git://
Pull perf fixes from Thomas Gleixner: "A bunch of fixes for perf and kprobes: - revert a commit that caused a perf group regression - silence dmesg spam - fix kprobe probing errors on ia64 and ppc64 - filter kprobe faults from userspace - lockdep fix for perf exit path - prevent perf #GP in KVM guest - correct perf event and filters" * 'perf-urgent-for-linus' of git:// kprobes: Fix "Failed to find blacklist" probing errors on ia64 and ppc64 kprobes/x86: Don't try to resolve kprobe faults from userspace perf/x86/intel: Avoid spamming kernel log for BTS buffer failure perf/x86/intel: Protect LBR and extra_regs against KVM lying perf: Fix lockdep warning on process exit perf/x86/intel/uncore: Fix SNB-EP/IVT Cbox filter mappings perf/x86/intel: Use proper dTLB-load-misses event on IvyBridge perf: Revert ("perf: Always destroy groups on exit")
Diffstat (limited to 'arch/x86/kernel/cpu/perf_event.c')
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 2bdfbff8a4f6..2879ecdaac43 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -118,6 +118,9 @@ static int x86_pmu_extra_regs(u64 config, struct perf_event *event)
if (event->attr.config1 & ~er->valid_mask)
return -EINVAL;
+ /* Check if the extra msrs can be safely accessed*/
+ if (!er->extra_msr_access)
+ return -ENXIO;
reg->idx = er->idx;
reg->config = event->attr.config1;