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@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

diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
index 4fc7219..835aeda 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 (file)
--- 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