leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/locking/mutex.c
View File

@@ -367,8 +367,7 @@ bool mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner,
/*
* Use vcpu_is_preempted to detect lock holder preemption issue.
*/
if (!owner->on_cpu || need_resched() ||
vcpu_is_preempted(task_cpu(owner))) {
if (!owner_on_cpu(owner) || need_resched()) {
ret = false;
break;
}
@@ -403,14 +402,8 @@ static inline int mutex_can_spin_on_owner(struct mutex *lock)
* structure won't go away during the spinning period.
*/
owner = __mutex_owner(lock);
/*
* As lock holder preemption issue, we both skip spinning if task is not
* on cpu or its cpu is preempted
*/
if (owner)
retval = owner->on_cpu && !vcpu_is_preempted(task_cpu(owner));
retval = owner_on_cpu(owner);
/*
* If lock->owner is not set, the mutex has been released. Return true