diff options
| author | Alexei Starovoitov <ast@kernel.org> | 2025-09-08 18:00:02 -0700 |
|---|---|---|
| committer | Vlastimil Babka <vbabka@suse.cz> | 2025-09-29 09:42:35 +0200 |
| commit | 4957089a23f41f31f8e7e22802a8ef9f5789c191 (patch) | |
| tree | 9531b4ed88e7710247c3f494720298ecfd3b1d2a /include/linux/local_lock_internal.h | |
| parent | 4ec1a08d20315d2d2a6f942ea563e5dadd988e98 (diff) | |
locking/local_lock: Introduce local_lock_is_locked().
Introduce local_lock_is_locked() that returns true when
given local_lock is locked by current cpu (in !PREEMPT_RT) or
by current task (in PREEMPT_RT).
The goal is to detect a deadlock by the caller.
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Diffstat (limited to 'include/linux/local_lock_internal.h')
| -rw-r--r-- | include/linux/local_lock_internal.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/local_lock_internal.h b/include/linux/local_lock_internal.h index 949de37700db..a4dc479157b5 100644 --- a/include/linux/local_lock_internal.h +++ b/include/linux/local_lock_internal.h @@ -165,6 +165,9 @@ do { \ !!tl; \ }) +/* preemption or migration must be disabled before calling __local_lock_is_locked */ +#define __local_lock_is_locked(lock) READ_ONCE(this_cpu_ptr(lock)->acquired) + #define __local_lock_release(lock) \ do { \ local_trylock_t *tl; \ @@ -285,4 +288,8 @@ do { \ __local_trylock(lock); \ }) +/* migration must be disabled before calling __local_lock_is_locked */ +#define __local_lock_is_locked(__lock) \ + (rt_mutex_owner(&this_cpu_ptr(__lock)->lock) == current) + #endif /* CONFIG_PREEMPT_RT */ |