Peter Zijlstra 95090e8a57 perf: Limit perf_event_attr::sample_period to 63 bits ...

commit 0819b2e30c 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>

2014-06-11 12:03:21 -07:00

..

callchain.c

perf: Add attribute to filter out callchains

2012-08-10 12:40:57 -03:00

core.c

perf: Limit perf_event_attr::sample_period to 63 bits

2014-06-11 12:03:21 -07:00

hw_breakpoint.c

hw_breakpoint: Use cpu_possible_mask in {reserve,release}_bp_slot()

2013-06-20 17:57:01 +02:00

internal.h

perf: Fix mmap() accounting hole

2013-06-19 12:44:13 +02:00

Makefile

uprobes: Move to kernel/events/

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

ring_buffer.c

perf: Fix perf ring buffer memory ordering

2013-11-20 12:27:47 -08:00

uprobes.c

uprobes: Fix utask->depth accounting in handle_trampoline()

2013-09-26 17:18:27 -07:00