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Diffstat (limited to 'kernel/locking/rwsem.h')
-rw-r--r--kernel/locking/rwsem.h21
1 files changed, 14 insertions, 7 deletions
diff --git a/kernel/locking/rwsem.h b/kernel/locking/rwsem.h
index 1d8f722a6761..3059a2dc39f8 100644
--- a/kernel/locking/rwsem.h
+++ b/kernel/locking/rwsem.h
@@ -27,9 +27,15 @@
#define RWSEM_ANONYMOUSLY_OWNED (1UL << 1)
#ifdef CONFIG_DEBUG_RWSEMS
-# define DEBUG_RWSEMS_WARN_ON(c) DEBUG_LOCKS_WARN_ON(c)
+# define DEBUG_RWSEMS_WARN_ON(c, sem) do { \
+ if (WARN_ONCE(c, "DEBUG_RWSEMS_WARN_ON(%s): count = 0x%lx, owner = 0x%lx, curr 0x%lx, list %sempty\n",\
+ #c, atomic_long_read(&(sem)->count), \
+ (long)((sem)->owner), (long)current, \
+ list_empty(&(sem)->wait_list) ? "" : "not ")) \
+ debug_locks_off(); \
+ } while (0)
#else
-# define DEBUG_RWSEMS_WARN_ON(c)
+# define DEBUG_RWSEMS_WARN_ON(c, sem)
#endif
/*
@@ -168,7 +174,7 @@ static inline void __down_read(struct rw_semaphore *sem)
if (unlikely(atomic_long_inc_return_acquire(&sem->count) <= 0)) {
rwsem_down_read_failed(sem);
DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner &
- RWSEM_READER_OWNED));
+ RWSEM_READER_OWNED), sem);
} else {
rwsem_set_reader_owned(sem);
}
@@ -180,7 +186,7 @@ static inline int __down_read_killable(struct rw_semaphore *sem)
if (IS_ERR(rwsem_down_read_failed_killable(sem)))
return -EINTR;
DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner &
- RWSEM_READER_OWNED));
+ RWSEM_READER_OWNED), sem);
} else {
rwsem_set_reader_owned(sem);
}
@@ -251,7 +257,8 @@ static inline void __up_read(struct rw_semaphore *sem)
{
long tmp;
- DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner & RWSEM_READER_OWNED));
+ DEBUG_RWSEMS_WARN_ON(!((unsigned long)sem->owner & RWSEM_READER_OWNED),
+ sem);
rwsem_clear_reader_owned(sem);
tmp = atomic_long_dec_return_release(&sem->count);
if (unlikely(tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0))
@@ -263,7 +270,7 @@ static inline void __up_read(struct rw_semaphore *sem)
*/
static inline void __up_write(struct rw_semaphore *sem)
{
- DEBUG_RWSEMS_WARN_ON(sem->owner != current);
+ DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
rwsem_clear_owner(sem);
if (unlikely(atomic_long_sub_return_release(RWSEM_ACTIVE_WRITE_BIAS,
&sem->count) < 0))
@@ -284,7 +291,7 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
* read-locked region is ok to be re-ordered into the
* write side. As such, rely on RELEASE semantics.
*/
- DEBUG_RWSEMS_WARN_ON(sem->owner != current);
+ DEBUG_RWSEMS_WARN_ON(sem->owner != current, sem);
tmp = atomic_long_add_return_release(-RWSEM_WAITING_BIAS, &sem->count);
rwsem_set_reader_owned(sem);
if (tmp < 0)