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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-05-13 10:02:57 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-05-15 09:46:57 +0200 |
| commit | a026dfecc035f213c1cfa0bf6407ce3155f6a9df (patch) | |
| tree | f65ed18c367f5856b0d643e46377de8463971d77 /arch | |
| parent | f5a5a2f6e69e88647ae12da39f0ff3a510bcf0a6 (diff) | |
| download | blackbird-op-linux-a026dfecc035f213c1cfa0bf6407ce3155f6a9df.tar.gz blackbird-op-linux-a026dfecc035f213c1cfa0bf6407ce3155f6a9df.zip | |
perf_counter: x86: Allow unpriviliged use of NMIs
Apply sysctl_perf_counter_priv to NMIs. Also, fail the counter
creation instead of silently down-grading to regular interrupts.
[ Impact: allow wider perf-counter usage ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_counter.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index 88ae8cebf3c1..c19e927b6979 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -280,8 +280,11 @@ static int __hw_perf_counter_init(struct perf_counter *counter) * If privileged enough, allow NMI events: */ hwc->nmi = 0; - if (capable(CAP_SYS_ADMIN) && hw_event->nmi) + if (hw_event->nmi) { + if (sysctl_perf_counter_priv && !capable(CAP_SYS_ADMIN)) + return -EACCES; hwc->nmi = 1; + } hwc->irq_period = hw_event->irq_period; if ((s64)hwc->irq_period <= 0 || hwc->irq_period > x86_pmu.max_period) |
