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| author |  Peter Zijlstra <peterz@infradead.org>
| 2023-08-01 22:41:25 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org>
| 2023-08-14 17:01:25 +0200 |
| commit | 4eb054f92b066ec0a0cba6896ee8eff4c91dfc9e (patch) | |
| tree | a5cb363039abb48b5847a8916f78f1a97510c7df /kernel/sched/core.c | |
| parent | sched: Simplify: migrate_swap_stop() (diff) | |
| download | linux-4eb054f92b066ec0a0cba6896ee8eff4c91dfc9e.tar.gz linux-4eb054f92b066ec0a0cba6896ee8eff4c91dfc9e.tar.bz2 linux-4eb054f92b066ec0a0cba6896ee8eff4c91dfc9e.zip | |
sched: Simplify wake_up_if_idle()
Use guards to reduce gotos and simplify control flow.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lore.kernel.org/r/20230801211812.032678917@infradead.org
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 66478a62f217..65ebf43206b6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3939,21 +3939,13 @@ static void __ttwu_queue_wakelist(struct task_struct *p, int cpu, int wake_flags void wake_up_if_idle(int cpu) { struct rq *rq = cpu_rq(cpu); - struct rq_flags rf; - - rcu_read_lock(); - if (!is_idle_task(rcu_dereference(rq->curr))) - goto out; - - rq_lock_irqsave(rq, &rf); - if (is_idle_task(rq->curr)) - resched_curr(rq); - /* Else CPU is not idle, do nothing here: */ - rq_unlock_irqrestore(rq, &rf); - -out: - rcu_read_unlock(); + guard(rcu)(); + if (is_idle_task(rcu_dereference(rq->curr))) { + guard(rq_lock_irqsave)(rq); + if (is_idle_task(rq->curr)) + resched_curr(rq); + } } bool cpus_share_cache(int this_cpu, int that_cpu) |