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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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5
kernel/locking/rtmutex.c
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@@ -1382,9 +1382,8 @@ static bool rtmutex_spin_on_owner(struct rt_mutex_base *lock,
* for CONFIG_PREEMPT_RCU=y)
* - the VCPU on which owner runs is preempted
*/
if (!owner->on_cpu || need_resched() ||
rt_mutex_waiter_is_top_waiter(lock, waiter) ||
vcpu_is_preempted(task_cpu(owner))) {
if (!owner_on_cpu(owner) || need_resched() ||
rt_mutex_waiter_is_top_waiter(lock, waiter)) {
res = false;
break;
}