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locking: Make owner_on_cpu() into <linux/sched.h>

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Move the owner_on_cpu() from kernel/locking/rwsem.c into
include/linux/sched.h with under CONFIG_SMP, then use it
in the mutex/rwsem/rtmutex to simplify the code.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211203075935.136808-2-wangkefeng.wang@huawei.com
This commit is contained in:
Kefeng Wang 2021-12-03 15:59:34 +08:00 • committed by Peter Zijlstra
parent 9a75bd0c52
commit c0bed69daf
4 changed files with 13 additions and 21 deletions
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9
include/linux/sched.h
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@ -2171,6 +2171,15 @@ extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
#endif
#ifdef CONFIG_SMP
static inline bool owner_on_cpu(struct task_struct *owner)
{
/*
* As lock holder preemption issue, we both skip spinning if
* task is not on cpu or its cpu is preempted
*/
return owner->on_cpu && !vcpu_is_preempted(task_cpu(owner));
}
/* Returns effective CPU energy utilization, as seen by the scheduler */
unsigned long sched_cpu_util(int cpu, unsigned long max);
#endif /* CONFIG_SMP */