diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-02-28 16:07:18 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-02-28 16:07:18 -0800 |
| commit | 405a41d7599be266ae6880e73252ca41770760fe (patch) | |
| tree | 1b9c7919feaedd1ad42c0e81b1bb30727a791377 /lib | |
| parent | 5c44ddaf7df3a06391684dde65083a092e06052b (diff) | |
| parent | b9a49520679e98700d3d89689cc91c08a1c88c1d (diff) | |
Merge tag 'locking-urgent-2025-02-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fix from Ingo Molnar:
"Fix an rcuref_put() slowpath race"
* tag 'locking-urgent-2025-02-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
rcuref: Plug slowpath race in rcuref_put()
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/rcuref.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/rcuref.c b/lib/rcuref.c index 97f300eca927..5bd726b71e39 100644 --- a/lib/rcuref.c +++ b/lib/rcuref.c @@ -220,6 +220,7 @@ EXPORT_SYMBOL_GPL(rcuref_get_slowpath); /** * rcuref_put_slowpath - Slowpath of __rcuref_put() * @ref: Pointer to the reference count + * @cnt: The resulting value of the fastpath decrement * * Invoked when the reference count is outside of the valid zone. * @@ -233,10 +234,8 @@ EXPORT_SYMBOL_GPL(rcuref_get_slowpath); * with a concurrent get()/put() pair. Caller is not allowed to * deconstruct the protected object. */ -bool rcuref_put_slowpath(rcuref_t *ref) +bool rcuref_put_slowpath(rcuref_t *ref, unsigned int cnt) { - unsigned int cnt = atomic_read(&ref->refcnt); - /* Did this drop the last reference? */ if (likely(cnt == RCUREF_NOREF)) { /* |