diff options
| 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 /include/linux/sched.h | |
| parent | 9a75bd0c52df6cff44735f73dfb9d00e67969fc5 (diff) | |
| download | lwn-c0bed69daf4b67809b58cc7cd81a8fa4f45bc161.tar.gz lwn-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 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 78c351e35fec..ff609d9c2f21 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -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 */ |