diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2018-10-27 00:06:23 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-27 01:26:32 +0200 |
| commit | 246b3b3342c9b0a2e24cda2178be87bc36e1c874 (patch) | |
| tree | 488a0d05debfd9f2dbf80aa7dde899c3eae0ea3f /kernel | |
| parent | sched: sched.h: make rq locking and clock functions available in stats.h (diff) | |
| download | linux-246b3b3342c9b0a2e24cda2178be87bc36e1c874.tar.xz linux-246b3b3342c9b0a2e24cda2178be87bc36e1c874.zip | |
sched: introduce this_rq_lock_irq()
do_sched_yield() disables IRQs, looks up this_rq() and locks it. The next
patch is adding another site with the same pattern, so provide a
convenience function for it.
Link: http://lkml.kernel.org/r/20180828172258.3185-8-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Suren Baghdasaryan <surenb@google.com>
Tested-by: Daniel Drake <drake@endlessm.com>
Cc: Christopher Lameter <cl@linux.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Weiner <jweiner@fb.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Enderborg <peter.enderborg@sony.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 4 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 12 |
2 files changed, 13 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2e696b03e99d..f3efef387797 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4933,9 +4933,7 @@ static void do_sched_yield(void) struct rq_flags rf; struct rq *rq; - local_irq_disable(); - rq = this_rq(); - rq_lock(rq, &rf); + rq = this_rq_lock_irq(&rf); schedstat_inc(rq->yld_count); current->sched_class->yield_task(rq); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 65a75b317935..1de189bb9209 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1157,6 +1157,18 @@ rq_unlock(struct rq *rq, struct rq_flags *rf) raw_spin_unlock(&rq->lock); } +static inline struct rq * +this_rq_lock_irq(struct rq_flags *rf) + __acquires(rq->lock) +{ + struct rq *rq; + + local_irq_disable(); + rq = this_rq(); + rq_lock(rq, rf); + return rq; +} + #ifdef CONFIG_NUMA enum numa_topology_type { NUMA_DIRECT, |