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locking/local_lock: Add missing owner initialization

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[ Upstream commit d8bbd97ad0b99a9394f2cd8410b884c48e218cf0 ]

If CONFIG_DEBUG_LOCK_ALLOC=y is enabled then local_lock_t has an 'owner'
member which is checked for consistency, but nothing initialized it to
zero explicitly.

The static initializer does so implicit, and the run time allocated per CPU
storage is usually zero initialized as well, but relying on that is not
really good practice.

Fixes: 91710728d1 ("locking: Introduce local_lock()")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211301.969975279@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Gleixner 2021-08-15 23:27:37 +02:00 committed by AuxXxilium
parent acfd11d007
commit 954f0ef51a
1 changed files with 23 additions and 19 deletions
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42
include/linux/local_lock_internal.h
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@ -14,29 +14,14 @@ typedef struct {
} local_lock_t;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define LL_DEP_MAP_INIT(lockname) \
# define LOCAL_LOCK_DEBUG_INIT(lockname) \
.dep_map = { \
.name = #lockname, \
.wait_type_inner = LD_WAIT_CONFIG, \
.lock_type = LD_LOCK_PERCPU, \
}
#else
# define LL_DEP_MAP_INIT(lockname)
#endif
.lock_type = LD_LOCK_PERCPU, \
}, \
.owner = NULL,
#define INIT_LOCAL_LOCK(lockname) { LL_DEP_MAP_INIT(lockname) }
#define __local_lock_init(lock) \
do { \
static struct lock_class_key __key; \
\
debug_check_no_locks_freed((void *)lock, sizeof(*lock));\
lockdep_init_map_type(&(lock)->dep_map, #lock, &__key, 0, \
LD_WAIT_CONFIG, LD_WAIT_INV, \
LD_LOCK_PERCPU); \
} while (0)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static inline void local_lock_acquire(local_lock_t *l)
{
lock_map_acquire(&l->dep_map);
@ -51,11 +36,30 @@ static inline void local_lock_release(local_lock_t *l)
lock_map_release(&l->dep_map);
}
static inline void local_lock_debug_init(local_lock_t *l)
{
l->owner = NULL;
}
#else /* CONFIG_DEBUG_LOCK_ALLOC */
# define LOCAL_LOCK_DEBUG_INIT(lockname)
static inline void local_lock_acquire(local_lock_t *l) { }
static inline void local_lock_release(local_lock_t *l) { }
static inline void local_lock_debug_init(local_lock_t *l) { }
#endif /* !CONFIG_DEBUG_LOCK_ALLOC */
#define INIT_LOCAL_LOCK(lockname) { LOCAL_LOCK_DEBUG_INIT(lockname) }
#define __local_lock_init(lock) \
do { \
static struct lock_class_key __key; \
\
debug_check_no_locks_freed((void *)lock, sizeof(*lock));\
lockdep_init_map_type(&(lock)->dep_map, #lock, &__key, \
0, LD_WAIT_CONFIG, LD_WAIT_INV, \
LD_LOCK_PERCPU); \
local_lock_debug_init(lock); \
} while (0)
#define __local_lock(lock) \
do { \
preempt_disable(); \