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| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2021-12-03 15:59:34 +0800 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-12-04 10:56:25 +0100 |
| commit | c0bed69daf4b67809b58cc7cd81a8fa4f45bc161 (patch) | |
| tree | 2e5eac02c318c1145dace9791e1e53b74ca0dc49 /kernel/locking/mutex.c | |
| parent | 9a75bd0c52df6cff44735f73dfb9d00e67969fc5 (diff) | |
| download | linux-stable-c0bed69daf4b67809b58cc7cd81a8fa4f45bc161.tar.gz linux-stable-c0bed69daf4b67809b58cc7cd81a8fa4f45bc161.tar.bz2 linux-stable-c0bed69daf4b67809b58cc7cd81a8fa4f45bc161.zip | |
locking: Make owner_on_cpu() into <linux/sched.h>
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
Diffstat (limited to 'kernel/locking/mutex.c')
| -rw-r--r-- | kernel/locking/mutex.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index db1913611192..5e3585950ec8 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -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 |