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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-10-31 12:37:04 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-11-11 14:37:23 +0100 |
| commit | 1e5a74059f9059d330744eac84873b1b99657008 (patch) | |
| tree | f32f8ac76d5a6c49c1b4cd8f83155af00007fac0 /kernel/sched_stoptask.c | |
| parent | 2d46709082c062cae7cce1a15f8cd4cd81b92d88 (diff) | |
| download | lwn-1e5a74059f9059d330744eac84873b1b99657008.tar.gz lwn-1e5a74059f9059d330744eac84873b1b99657008.zip | |
sched: Fix cross-sched-class wakeup preemption
Instead of dealing with sched classes inside each check_preempt_curr()
implementation, pull out this logic into the generic wakeup preemption
path.
This fixes a hang in KVM (and others) where we are waiting for the
stop machine thread to run ...
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Tested-by: Marcelo Tosatti <mtosatti@redhat.com>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1288891946.2039.31.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_stoptask.c')
| -rw-r--r-- | kernel/sched_stoptask.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched_stoptask.c b/kernel/sched_stoptask.c index 755483b2a2ad..2bf6b47058c1 100644 --- a/kernel/sched_stoptask.c +++ b/kernel/sched_stoptask.c @@ -19,7 +19,7 @@ select_task_rq_stop(struct rq *rq, struct task_struct *p, static void check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags) { - resched_task(rq->curr); /* we preempt everything */ + /* we're never preempted */ } static struct task_struct *pick_next_task_stop(struct rq *rq) |