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Diffstat (limited to 'include/linux/local_lock_internal.h')
-rw-r--r--include/linux/local_lock_internal.h86
1 files changed, 67 insertions, 19 deletions
diff --git a/include/linux/local_lock_internal.h b/include/linux/local_lock_internal.h
index ded90b097e6e..975e33b793a7 100644
--- a/include/linux/local_lock_internal.h
+++ b/include/linux/local_lock_internal.h
@@ -6,6 +6,8 @@
#include <linux/percpu-defs.h>
#include <linux/lockdep.h>
+#ifndef CONFIG_PREEMPT_RT
+
typedef struct {
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
@@ -14,29 +16,14 @@ 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
-
-#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)
+ .lock_type = LD_LOCK_PERCPU, \
+ }, \
+ .owner = NULL,
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
static inline void local_lock_acquire(local_lock_t *l)
{
lock_map_acquire(&l->dep_map);
@@ -51,11 +38,30 @@ 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(); \
@@ -91,3 +97,45 @@ static inline void local_lock_release(local_lock_t *l) { }
local_lock_release(this_cpu_ptr(lock)); \
local_irq_restore(flags); \
} while (0)
+
+#else /* !CONFIG_PREEMPT_RT */
+
+/*
+ * On PREEMPT_RT local_lock maps to a per CPU spinlock, which protects the
+ * critical section while staying preemptible.
+ */
+typedef spinlock_t local_lock_t;
+
+#define INIT_LOCAL_LOCK(lockname) __LOCAL_SPIN_LOCK_UNLOCKED((lockname))
+
+#define __local_lock_init(l) \
+ do { \
+ local_spin_lock_init((l)); \
+ } while (0)
+
+#define __local_lock(__lock) \
+ do { \
+ migrate_disable(); \
+ spin_lock(this_cpu_ptr((__lock))); \
+ } while (0)
+
+#define __local_lock_irq(lock) __local_lock(lock)
+
+#define __local_lock_irqsave(lock, flags) \
+ do { \
+ typecheck(unsigned long, flags); \
+ flags = 0; \
+ __local_lock(lock); \
+ } while (0)
+
+#define __local_unlock(__lock) \
+ do { \
+ spin_unlock(this_cpu_ptr((__lock))); \
+ migrate_enable(); \
+ } while (0)
+
+#define __local_unlock_irq(lock) __local_unlock(lock)
+
+#define __local_unlock_irqrestore(lock, flags) __local_unlock(lock)
+
+#endif /* CONFIG_PREEMPT_RT */