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locking/spinlock/rt: Prepare for RT local_lock

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Add the static and runtime initializer mechanics to support the RT variant
of local_lock, which requires the lock type in the lockdep map to be set
to LD_LOCK_PERCPU.

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/20210815211305.967526724@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-08-15 23:29:27 +02:00 committed by Ingo Molnar
parent 992caf7f17
commit 31552385f8
4 changed files with 35 additions and 10 deletions
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14
include/linux/spinlock_rt.h
View File

@ -8,10 +8,10 @@
#ifdef CONFIG_DEBUG_LOCK_ALLOC
extern void __rt_spin_lock_init(spinlock_t *lock, const char *name,
struct lock_class_key *key);
struct lock_class_key *key, bool percpu);
#else
static inline void __rt_spin_lock_init(spinlock_t *lock, const char *name,
struct lock_class_key *key)
struct lock_class_key *key, bool percpu)
{
}
#endif
@ -21,7 +21,15 @@ do { \
static struct lock_class_key __key; \
\
rt_mutex_base_init(&(slock)->lock); \
__rt_spin_lock_init(slock, #slock, &__key); \
__rt_spin_lock_init(slock, #slock, &__key, false); \
} while (0)
#define local_spin_lock_init(slock) \
do { \
static struct lock_class_key __key; \
\
rt_mutex_base_init(&(slock)->lock); \
__rt_spin_lock_init(slock, #slock, &__key, true); \
} while (0)
extern void rt_spin_lock(spinlock_t *lock);

6
include/linux/spinlock_types.h
View File

@ -60,6 +60,12 @@ typedef struct spinlock {
SPIN_DEP_MAP_INIT(name) \
}
#define __LOCAL_SPIN_LOCK_UNLOCKED(name) \
{ \
.lock = __RT_MUTEX_BASE_INITIALIZER(name.lock), \
LOCAL_SPIN_DEP_MAP_INIT(name) \
}
#define DEFINE_SPINLOCK(name) \
spinlock_t name = __SPIN_LOCK_UNLOCKED(name)

8
include/linux/spinlock_types_raw.h
View File

@ -37,9 +37,17 @@ typedef struct raw_spinlock {
.name = #lockname, \
.wait_type_inner = LD_WAIT_CONFIG, \
}
# define LOCAL_SPIN_DEP_MAP_INIT(lockname) \
.dep_map = { \
.name = #lockname, \
.wait_type_inner = LD_WAIT_CONFIG, \
.lock_type = LD_LOCK_PERCPU, \
}
#else
# define RAW_SPIN_DEP_MAP_INIT(lockname)
# define SPIN_DEP_MAP_INIT(lockname)
# define LOCAL_SPIN_DEP_MAP_INIT(lockname)
#endif
#ifdef CONFIG_DEBUG_SPINLOCK

7
kernel/locking/spinlock_rt.c
View File

@ -120,10 +120,13 @@ EXPORT_SYMBOL(rt_spin_trylock_bh);
#ifdef CONFIG_DEBUG_LOCK_ALLOC
void __rt_spin_lock_init(spinlock_t *lock, const char *name,
struct lock_class_key *key)
struct lock_class_key *key, bool percpu)
{
u8 type = percpu ? LD_LOCK_PERCPU : LD_LOCK_NORMAL;
debug_check_no_locks_freed((void *)lock, sizeof(*lock));
lockdep_init_map_wait(&lock->dep_map, name, key, 0, LD_WAIT_CONFIG);
lockdep_init_map_type(&lock->dep_map, name, key, 0, LD_WAIT_CONFIG,
LD_WAIT_INV, type);
}
EXPORT_SYMBOL(__rt_spin_lock_init);
#endif