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.

Christoph Hellwig committed 11 months ago

Commit 12eef141 parent c752c212 files · +3 −0Browse files

Showing the changes to include/linux (1 of 2 files). Show all

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include/linux/lockref.h+2−0

@@ -50,6 +50,8 @@ void lockref_get(struct lockref *lockref); · 49 unmodified lines
50	int lockref_put_return(struct lockref *lockref);	50	int lockref_put_return(struct lockref *lockref);
51	bool lockref_get_not_zero(struct lockref *lockref);	51	bool lockref_get_not_zero(struct lockref *lockref);
52	bool lockref_put_or_lock(struct lockref *lockref);	52	bool lockref_put_or_lock(struct lockref *lockref);
		53	#define lockref_put_or_lock(_lockref) \
		54	(!__cond_lock((_lockref)->lock, !lockref_put_or_lock(_lockref)))
53		55
54	void lockref_mark_dead(struct lockref *lockref);	56	void lockref_mark_dead(struct lockref *lockref);
55	bool lockref_get_not_dead(struct lockref *lockref);	57	bool lockref_get_not_dead(struct lockref *lockref);