diff options
author | Stephen Rothwell <sfr@canb.auug.org.au> | 2008-08-22 10:42:23 +1000 |
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committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2008-08-22 10:42:23 +1000 |
commit | be21d065e6d1443c0720d76502513c5efe418403 (patch) | |
tree | 623a67a7f7beb744535032ceba6ac2d11dd46c53 /kernel/sched_clock.c | |
parent | 44fbdd467bea6c7fadab795176a15da167b86859 (diff) | |
parent | cdca408f6f55290eec706abad51826e113f2a091 (diff) |
Merge commit 'ftrace/auto-ftrace-next'
Conflicts:
kernel/module.c
Diffstat (limited to 'kernel/sched_clock.c')
-rw-r--r-- | kernel/sched_clock.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c index 204991a0bfa7..24b0092fac11 100644 --- a/kernel/sched_clock.c +++ b/kernel/sched_clock.c @@ -31,6 +31,7 @@ #include <linux/spinlock.h> #include <linux/ktime.h> #include <linux/module.h> +#include <linux/hardirq.h> /* * Scheduler clock - returns current time in nanosec units. @@ -151,6 +152,13 @@ u64 sched_clock_cpu(int cpu) struct sched_clock_data *scd = cpu_sdc(cpu); u64 now, clock, this_clock, remote_clock; + /* + * Normally this is not called in NMI context - but if it is, + * trying to do any locking here is totally lethal. + */ + if (unlikely(in_nmi())) + return scd->clock; + if (unlikely(!sched_clock_running)) return 0ull; |