sched: Fix cond_resched_lock() in !CONFIG_PREEMPT
authorFrederic Weisbecker <fweisbec@gmail.com>
Fri, 24 Jul 2009 18:05:23 +0000 (20:05 +0200)
committerIngo Molnar <mingo@elte.hu>
Sun, 2 Aug 2009 12:03:57 +0000 (14:03 +0200)
commit716a42348cdaf04534b15fbdc9c83e25baebfed5
tree5a49fe4c0ff258ee03478994ffc7fbe8032a340f
parenta004cd42181409eda70804ded240a791f4564d61
sched: Fix cond_resched_lock() in !CONFIG_PREEMPT

The might_sleep() test inside cond_resched_lock() assumes the
spinlock is held and then preemption is disabled. This is true
with CONFIG_PREEMPT but the preempt_count() doesn't change
otherwise.

Check by starting from the appropriate preempt offset depending
on the config.

Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1248458723-12146-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
include/linux/sched.h