The following commit has been merged into the locking/core branch of tip:
Commit-ID: 52e0874fc16bd26e9ea1871e30ffb2c6dff187cf
Gitweb: https://git.kernel.org/tip/52e0874fc16bd26e9ea1871e30ffb2c6dff187cf
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Mon, 12 Aug 2024 12:39:02 +02:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Thu, 24 Oct 2024 11:27:01 +02:00
locking/rt: Add sparse annotation PREEMPT_RT's sleeping locks.
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
---
include/linux/rwlock_rt.h | 10 +++++-----
include/linux/spinlock_rt.h | 8 ++++----
2 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/include/linux/rwlock_rt.h b/include/linux/rwlock_rt.h
index 8544ff0..7d81fc6 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 61c49b1..babc3e0 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);
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