This is a note to let you know that I've just added the patch titled
locking/rt: Add sparse annotation PREEMPT_RT's sleeping locks.
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
locking-rt-add-sparse-annotation-preempt_rt-s-sleepi.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f3ebf6751c935ff27207516558feec7e9c94bd9f
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Mon Aug 12 12:39:02 2024 +0200
locking/rt: Add sparse annotation PREEMPT_RT's sleeping locks.
[ Upstream commit 52e0874fc16bd26e9ea1871e30ffb2c6dff187cf ]
The sleeping locks on PREEMPT_RT (rt_spin_lock() and friends) lack
sparse annotation. Therefore a missing spin_unlock() won't be spotted by
sparse in a PREEMPT_RT build while it is noticed on a !PREEMPT_RT build.
Add the __acquires/__releases macros to the lock/ unlock functions. The
trylock functions already use the __cond_lock() wrapper.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20240812104200.2239232-2-bigeasy@xxxxxxxxxxxxx
Stable-dep-of: 5c2e7736e20d ("rust: helpers: Avoid raw_spin_lock initialization for PREEMPT_RT")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/rwlock_rt.h b/include/linux/rwlock_rt.h
index 8544ff05e594d..7d81fc6918ee8 100644
--- a/include/linux/rwlock_rt.h
+++ b/include/linux/rwlock_rt.h
@@ -24,13 +24,13 @@ do { \
__rt_rwlock_init(rwl, #rwl, &__key); \
} while (0)
-extern void rt_read_lock(rwlock_t *rwlock);
+extern void rt_read_lock(rwlock_t *rwlock) __acquires(rwlock);
extern int rt_read_trylock(rwlock_t *rwlock);
-extern void rt_read_unlock(rwlock_t *rwlock);
-extern void rt_write_lock(rwlock_t *rwlock);
-extern void rt_write_lock_nested(rwlock_t *rwlock, int subclass);
+extern void rt_read_unlock(rwlock_t *rwlock) __releases(rwlock);
+extern void rt_write_lock(rwlock_t *rwlock) __acquires(rwlock);
+extern void rt_write_lock_nested(rwlock_t *rwlock, int subclass) __acquires(rwlock);
extern int rt_write_trylock(rwlock_t *rwlock);
-extern void rt_write_unlock(rwlock_t *rwlock);
+extern void rt_write_unlock(rwlock_t *rwlock) __releases(rwlock);
static __always_inline void read_lock(rwlock_t *rwlock)
{
diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
index 61c49b16f69ab..babc3e0287791 100644
--- a/include/linux/spinlock_rt.h
+++ b/include/linux/spinlock_rt.h
@@ -32,10 +32,10 @@ do { \
__rt_spin_lock_init(slock, #slock, &__key, true); \
} while (0)
-extern void rt_spin_lock(spinlock_t *lock);
-extern void rt_spin_lock_nested(spinlock_t *lock, int subclass);
-extern void rt_spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *nest_lock);
-extern void rt_spin_unlock(spinlock_t *lock);
+extern void rt_spin_lock(spinlock_t *lock) __acquires(lock);
+extern void rt_spin_lock_nested(spinlock_t *lock, int subclass) __acquires(lock);
+extern void rt_spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *nest_lock) __acquires(lock);
+extern void rt_spin_unlock(spinlock_t *lock) __releases(lock);
extern void rt_spin_lock_unlock(spinlock_t *lock);
extern int rt_spin_trylock_bh(spinlock_t *lock);
extern int rt_spin_trylock(spinlock_t *lock);
