diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2014-05-15 20:23:48 +0200 |
|---|---|---|
| committer | Show Liu <show.liu@linaro.org> | 2014-06-18 12:05:17 +0800 |
| commit | 80e48078a05d99c80051efb7509f87ae95d08914 (patch) | |
| tree | dd725ec2c727000c189a8362b577c1bf6ffca4bf /kernel/time.c | |
| parent | cfb8ee015ee76965974e8270dba24dd2b5f3349f (diff) | |
perf: Limit perf_event_attr::sample_period to 63 bits
commit 0819b2e30ccb93edf04876237b6205eef84ec8d2 upstream.
Vince reported that using a large sample_period (one with bit 63 set)
results in wreckage since while the sample_period is fundamentally
unsigned (negative periods don't make sense) the way we implement
things very much rely on signed logic.
So limit sample_period to 63 bits to avoid tripping over this.
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-p25fhunibl4y3qi0zuqmyf4b@git.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/time.c')
0 files changed, 0 insertions, 0 deletions