linux/include
Peter Zijlstra c33a0bc4e4 perf_counter: fix race in perf_output_*
When two (or more) contexts output to the same buffer, it is possible
to observe half written output.

Suppose we have CPU0 doing perf_counter_mmap(), CPU1 doing
perf_counter_overflow(). If CPU1 does a wakeup and exposes head to
user-space, then CPU2 can observe the data CPU0 is still writing.

[ Impact: fix occasionally corrupted profiling records ]

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: <20090501102533.007821627@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-05-01 13:23:43 +02:00
..
acpi Merge branch 'drm-intel-next' of git://git.kernel.org/pub/scm/linux/kernel/git/anholt/drm-intel 2009-04-28 17:21:20 -07:00
asm-generic Remove unused support code for refok sections. 2009-04-27 19:51:58 -07:00
crypto
drm drm/i915: add support for G41 chipset 2009-04-21 17:22:53 -07:00
keys
linux perf_counter: fix race in perf_output_* 2009-05-01 13:23:43 +02:00
math-emu
media V4L/DVB (11381): ivtv/cx18: remove VIDIOC_INT_S_AUDIO_ROUTING debug support. 2009-04-06 21:44:28 -03:00
mtd make MTD headers use strict integer types 2009-03-26 18:14:17 +01:00
net Bluetooth: Add different pairing timeout for Legacy Pairing 2009-04-28 09:31:38 -07:00
pcmcia
rdma Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-03-26 15:54:36 -07:00
rxrpc
scsi PM/Hibernate: Wait for SCSI devices scan to complete during resume 2009-04-13 11:37:07 -07:00
sound Merge branch 'fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6 2009-04-20 14:03:04 +01:00
trace tracing/syscalls: use a dedicated file header 2009-04-09 05:43:32 +02:00
video include/video/cyblafb.h: remove it, it's unused 2009-04-13 15:04:30 -07:00
xen
Kbuild