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lockref: add a __cond_lock annotation for lockref_put_or_lock 

Add a cond_lock annotation for lockref_put_or_lock to make sparse
happy with using it.  Note that for this the return value has to be
double-inverted as the return value convention of lockref_put_or_lock
is inverted compared to _trylock conventions expected by __cond_lock,
as lockref_put_or_lock returns true when it did not need to take the
lock.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
master
Christoph Hellwig 2025-12-09 09:18:57 +01:00 committed by Linus Torvalds
parent c752c21c90
commit 12eef14bcb
2 changed files with 3 additions and 0 deletions
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2
include/linux/lockref.h
View File

@ -50,6 +50,8 @@ void lockref_get(struct lockref *lockref);
int lockref_put_return(struct lockref *lockref);
bool lockref_get_not_zero(struct lockref *lockref);
bool lockref_put_or_lock(struct lockref *lockref);
#define lockref_put_or_lock(_lockref) \
(!__cond_lock((_lockref)->lock, !lockref_put_or_lock(_lockref)))
void lockref_mark_dead(struct lockref *lockref);
bool lockref_get_not_dead(struct lockref *lockref);

1
lib/lockref.c
View File

@ -105,6 +105,7 @@ EXPORT_SYMBOL(lockref_put_return);
* @lockref: pointer to lockref structure
* Return: 1 if count updated successfully or 0 if count <= 1 and lock taken
*/
#undef lockref_put_or_lock
bool lockref_put_or_lock(struct lockref *lockref)
{
CMPXCHG_LOOP(