The following commit has been merged into the locking/core branch of tip:
Commit-ID: 31552385f8e9d0869117014bf8e55ba0497e3ec8
Gitweb: https://git.kernel.org/tip/31552385f8e9d0869117014bf8e55ba0497e3ec8
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Sun, 15 Aug 2021 23:29:27 +02:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 17 Aug 2021 19:06:13 +02:00
locking/spinlock/rt: Prepare for RT local_lock
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@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210815211305.967526724@xxxxxxxxxxxxx
---
include/linux/spinlock_rt.h | 24 ++++++++++++++++--------
include/linux/spinlock_types.h | 6 ++++++
include/linux/spinlock_types_raw.h | 8 ++++++++
kernel/locking/spinlock_rt.c | 7 +++++--
4 files changed, 35 insertions(+), 10 deletions(-)
diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
index 4fc7219..835aeda 100644
--- a/include/linux/spinlock_rt.h
+++ b/include/linux/spinlock_rt.h
@@ -8,20 +8,28 @@
#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
-#define spin_lock_init(slock) \
-do { \
- static struct lock_class_key __key; \
- \
- rt_mutex_base_init(&(slock)->lock); \
- __rt_spin_lock_init(slock, #slock, &__key); \
+#define spin_lock_init(slock) \
+do { \
+ static struct lock_class_key __key; \
+ \
+ rt_mutex_base_init(&(slock)->lock); \
+ __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);
diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index 8a9aadb..2dfa35f 100644
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -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)
diff --git a/include/linux/spinlock_types_raw.h b/include/linux/spinlock_types_raw.h
index a8a4330..91cb36b 100644
--- a/include/linux/spinlock_types_raw.h
+++ b/include/linux/spinlock_types_raw.h
@@ -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
diff --git a/kernel/locking/spinlock_rt.c b/kernel/locking/spinlock_rt.c
index c36648b..d2912e4 100644
--- a/kernel/locking/spinlock_rt.c
+++ b/kernel/locking/spinlock_rt.c
@@ -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
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