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perf_counter: x86: Allow unpriviliged use of NMIs

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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>
This commit is contained in:
Peter Zijlstra 2009-05-13 10:02:57 +02:00 committed by Ingo Molnar
parent f5a5a2f6e6
commit a026dfecc0
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/cpu/perf_counter.c
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@ -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)