diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2015-06-11 14:46:54 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-06-19 00:25:27 +0200 |
| commit | cbce1a686700595de65ee363b9b3283ae85d8fc5 (patch) | |
| tree | f5ab615f38d916532fe96df9914aa2df926ba98a /kernel/sched/rt.c | |
| parent | lockdep: Implement lock pinning (diff) | |
| download | linux-cbce1a686700595de65ee363b9b3283ae85d8fc5.tar.xz linux-cbce1a686700595de65ee363b9b3283ae85d8fc5.zip | |
sched,lockdep: Employ lock pinning
Employ the new lockdep lock pinning annotation to ensure no
'accidental' lock-breaks happen with rq->lock.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: ktkhai@parallels.com
Cc: rostedt@goodmis.org
Cc: juri.lelli@gmail.com
Cc: pang.xunlei@linaro.org
Cc: oleg@redhat.com
Cc: wanpeng.li@linux.intel.com
Cc: umgwanakikbuti@gmail.com
Link: http://lkml.kernel.org/r/20150611124744.003233193@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sched/rt.c')
| -rw-r--r-- | kernel/sched/rt.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 460f85888b74..0d193a243e96 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1478,7 +1478,15 @@ pick_next_task_rt(struct rq *rq, struct task_struct *prev) struct rt_rq *rt_rq = &rq->rt; if (need_pull_rt_task(rq, prev)) { + /* + * This is OK, because current is on_cpu, which avoids it being + * picked for load-balance and preemption/IRQs are still + * disabled avoiding further scheduler activity on it and we're + * being very careful to re-start the picking loop. + */ + lockdep_unpin_lock(&rq->lock); pull_rt_task(rq); + lockdep_pin_lock(&rq->lock); /* * pull_rt_task() can drop (and re-acquire) rq->lock; this * means a dl or stop task can slip in, in which case we need |