Peter Zijlstra 0819b2e30c perf: Limit perf_event_attr::sample_period to 63 bits ...

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>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/n/tip-p25fhunibl4y3qi0zuqmyf4b@git.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2014-05-19 21:44:55 +09:00

..

callchain.c

perf: Roll back callchain buffer refcount under the callchain mutex

2013-08-16 17:55:50 +02:00

core.c

perf: Limit perf_event_attr::sample_period to 63 bits

2014-05-19 21:44:55 +09:00

hw_breakpoint.c

hw_breakpoint: Introduce "struct bp_cpuinfo"

2013-06-20 17:58:57 +02:00

internal.h

perf: Fix arch_perf_out_copy_user default

2013-11-06 12:34:25 +01:00

Makefile

uprobes: Move to kernel/events/

2012-02-22 11:08:00 +01:00

ring_buffer.c

perf: Optimize ring-buffer write by depending on control dependencies

2013-12-11 15:53:22 +01:00

uprobes.c

uprobes: allow ignoring of probe hits

2014-03-18 16:39:34 -04:00