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Commit f7c0160a authored by Thomas Gleixner's avatar Thomas Gleixner
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locks: Split rwlocks from spinlocks 

Preparatory patch for atomic_spinlocks and preempt-rt. rwlocks are
always converted to sleeping locks on preempt-rt. Split the code so
the later preempt-rt conversions can be done by excluding the separate
files.
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 4be3bd78
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Showing with 526 additions and 406 deletions
include/linux/rwlock.h 0 → 100644
View file @ f7c0160a
#ifndef __LINUX_RWLOCK_H
#define __LINUX_RWLOCK_H
#ifndef __LINUX_SPINLOCK_H
# error "please don't include this file directly"
#endif
/*
* rwlock related methods
*
* split out from spinlock.h
*
* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
* Released under the General Public License (GPL).
*/
#ifdef CONFIG_DEBUG_SPINLOCK
extern void __rwlock_init(rwlock_t *lock, const char *name,
struct lock_class_key *key);
# define rwlock_init(lock) \
do { \
static struct lock_class_key __key; \
\
__rwlock_init((lock), #lock, &__key); \
} while (0)
#else
# define rwlock_init(lock) \
do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
extern void _raw_read_lock(rwlock_t *lock);
#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
extern int _raw_read_trylock(rwlock_t *lock);
extern void _raw_read_unlock(rwlock_t *lock);
extern void _raw_write_lock(rwlock_t *lock);
#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
extern int _raw_write_trylock(rwlock_t *lock);
extern void _raw_write_unlock(rwlock_t *lock);
#else
# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
# define _raw_read_lock_flags(lock, flags) \
__raw_read_lock_flags(&(lock)->raw_lock, *(flags))
# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
# define _raw_write_lock_flags(lock, flags) \
__raw_write_lock_flags(&(lock)->raw_lock, *(flags))
# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
#endif
#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
/*
* Define the various rw_lock methods. Note we define these
* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
* various methods are defined as nops in the case they are not
* required.
*/
#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
#define write_lock(lock) _write_lock(lock)
#define read_lock(lock) _read_lock(lock)
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
#define read_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
flags = _read_lock_irqsave(lock); \
} while (0)
#define write_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
flags = _write_lock_irqsave(lock); \
} while (0)
#else
#define read_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_read_lock_irqsave(lock, flags); \
} while (0)
#define write_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_write_lock_irqsave(lock, flags); \
} while (0)
#endif
#define read_lock_irq(lock) _read_lock_irq(lock)
#define read_lock_bh(lock) _read_lock_bh(lock)
#define write_lock_irq(lock) _write_lock_irq(lock)
#define write_lock_bh(lock) _write_lock_bh(lock)
/*
* We inline the unlock functions in the nondebug case:
*/
#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \
!defined(CONFIG_SMP)
# define read_unlock(lock) _read_unlock(lock)
# define write_unlock(lock) _write_unlock(lock)
# define read_unlock_irq(lock) _read_unlock_irq(lock)
# define write_unlock_irq(lock) _write_unlock_irq(lock)
#else
# define read_unlock(lock) \
do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define write_unlock(lock) \
do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define read_unlock_irq(lock) \
do { \
__raw_read_unlock(&(lock)->raw_lock); \
__release(lock); \
local_irq_enable(); \
} while (0)
# define write_unlock_irq(lock) \
do { \
__raw_write_unlock(&(lock)->raw_lock); \
__release(lock); \
local_irq_enable(); \
} while (0)
#endif
#define read_unlock_irqrestore(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_read_unlock_irqrestore(lock, flags); \
} while (0)
#define read_unlock_bh(lock) _read_unlock_bh(lock)
#define write_unlock_irqrestore(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_write_unlock_irqrestore(lock, flags); \
} while (0)
#define write_unlock_bh(lock) _write_unlock_bh(lock)
#define write_trylock_irqsave(lock, flags) \
({ \
local_irq_save(flags); \
write_trylock(lock) ? \
1 : ({ local_irq_restore(flags); 0; }); \
})
#endif /* __LINUX_RWLOCK_H */
include/linux/rwlock_types.h 0 → 100644
View file @ f7c0160a
#ifndef __LINUX_RWLOCK_TYPES_H
#define __LINUX_RWLOCK_TYPES_H
/*
* include/linux/rwlock_types.h - generic rwlock type definitions
* and initializers
*
* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
* Released under the General Public License (GPL).
*/
typedef struct {
raw_rwlock_t raw_lock;
#ifdef CONFIG_GENERIC_LOCKBREAK
unsigned int break_lock;
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
unsigned int magic, owner_cpu;
void *owner;
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif
} rwlock_t;
#define RWLOCK_MAGIC 0xdeaf1eed
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
#else
# define RW_DEP_MAP_INIT(lockname)
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
#define __RW_LOCK_UNLOCKED(lockname) \
(rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \
.magic = RWLOCK_MAGIC, \
.owner = SPINLOCK_OWNER_INIT, \
.owner_cpu = -1, \
RW_DEP_MAP_INIT(lockname) }
#else
#define __RW_LOCK_UNLOCKED(lockname) \
(rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \
RW_DEP_MAP_INIT(lockname) }
#endif
/*
* RW_LOCK_UNLOCKED defeat lockdep state tracking and is hence
* deprecated.
*
* Please use DEFINE_RWLOCK() or __RW_LOCK_UNLOCKED() as appropriate.
*/
#define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init)
#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
#endif /* __LINUX_RWLOCK_TYPES_H */
include/linux/spinlock.h
View file @ f7c0160a
...@@ -105,20 +105,6 @@ do { \ ...@@ -105,20 +105,6 @@ do { \
do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0) do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
#endif #endif
#ifdef CONFIG_DEBUG_SPINLOCK
extern void __rwlock_init(rwlock_t *lock, const char *name,
struct lock_class_key *key);
# define rwlock_init(lock) \
do { \
static struct lock_class_key __key; \
\
__rwlock_init((lock), #lock, &__key); \
} while (0)
#else
# define rwlock_init(lock) \
do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
#endif
#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock) #define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock)
#ifdef CONFIG_GENERIC_LOCKBREAK #ifdef CONFIG_GENERIC_LOCKBREAK
...@@ -157,43 +143,21 @@ static inline void smp_mb__after_lock(void) { smp_mb(); } ...@@ -157,43 +143,21 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock) #define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
extern int _raw_spin_trylock(spinlock_t *lock); extern int _raw_spin_trylock(spinlock_t *lock);
extern void _raw_spin_unlock(spinlock_t *lock); extern void _raw_spin_unlock(spinlock_t *lock);
extern void _raw_read_lock(rwlock_t *lock);
#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
extern int _raw_read_trylock(rwlock_t *lock);
extern void _raw_read_unlock(rwlock_t *lock);
extern void _raw_write_lock(rwlock_t *lock);
#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
extern int _raw_write_trylock(rwlock_t *lock);
extern void _raw_write_unlock(rwlock_t *lock);
#else #else
# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock) # define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
# define _raw_spin_lock_flags(lock, flags) \ # define _raw_spin_lock_flags(lock, flags) \
__raw_spin_lock_flags(&(lock)->raw_lock, *(flags)) __raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock) # define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock) # define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
# define _raw_read_lock_flags(lock, flags) \
__raw_read_lock_flags(&(lock)->raw_lock, *(flags))
# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
# define _raw_write_lock_flags(lock, flags) \
__raw_write_lock_flags(&(lock)->raw_lock, *(flags))
# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
#endif #endif
#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
/* /*
* Define the various spin_lock and rw_lock methods. Note we define these * Define the various spin_lock and methods. Note we define these
* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
* methods are defined as nops in the case they are not required. * various methods are defined as nops in the case they are not
* required.
*/ */
#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock)) #define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
#define spin_lock(lock) _spin_lock(lock) #define spin_lock(lock) _spin_lock(lock)
...@@ -209,9 +173,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); } ...@@ -209,9 +173,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock) # define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
#endif #endif
#define write_lock(lock) _write_lock(lock)
#define read_lock(lock) _read_lock(lock)
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
#define spin_lock_irqsave(lock, flags) \ #define spin_lock_irqsave(lock, flags) \
...@@ -219,16 +180,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); } ...@@ -219,16 +180,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
typecheck(unsigned long, flags); \ typecheck(unsigned long, flags); \
flags = _spin_lock_irqsave(lock); \ flags = _spin_lock_irqsave(lock); \
} while (0) } while (0)
#define read_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
flags = _read_lock_irqsave(lock); \
} while (0)
#define write_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
flags = _write_lock_irqsave(lock); \
} while (0)
#ifdef CONFIG_DEBUG_LOCK_ALLOC #ifdef CONFIG_DEBUG_LOCK_ALLOC
#define spin_lock_irqsave_nested(lock, flags, subclass) \ #define spin_lock_irqsave_nested(lock, flags, subclass) \
...@@ -251,16 +202,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); } ...@@ -251,16 +202,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
typecheck(unsigned long, flags); \ typecheck(unsigned long, flags); \
_spin_lock_irqsave(lock, flags); \ _spin_lock_irqsave(lock, flags); \
} while (0) } while (0)
#define read_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_read_lock_irqsave(lock, flags); \
} while (0)
#define write_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_write_lock_irqsave(lock, flags); \
} while (0)
#define spin_lock_irqsave_nested(lock, flags, subclass) \ #define spin_lock_irqsave_nested(lock, flags, subclass) \
spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
...@@ -269,48 +210,22 @@ static inline void smp_mb__after_lock(void) { smp_mb(); } ...@@ -269,48 +210,22 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
#define spin_lock_irq(lock) _spin_lock_irq(lock) #define spin_lock_irq(lock) _spin_lock_irq(lock)
#define spin_lock_bh(lock) _spin_lock_bh(lock) #define spin_lock_bh(lock) _spin_lock_bh(lock)
#define read_lock_irq(lock) _read_lock_irq(lock)
#define read_lock_bh(lock) _read_lock_bh(lock)
#define write_lock_irq(lock) _write_lock_irq(lock)
#define write_lock_bh(lock) _write_lock_bh(lock)
/* /*
* We inline the unlock functions in the nondebug case: * We inline the unlock functions in the nondebug case:
*/ */
#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \ #if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \
!defined(CONFIG_SMP) !defined(CONFIG_SMP)
# define spin_unlock(lock) _spin_unlock(lock) # define spin_unlock(lock) _spin_unlock(lock)
# define read_unlock(lock) _read_unlock(lock)
# define write_unlock(lock) _write_unlock(lock)
# define spin_unlock_irq(lock) _spin_unlock_irq(lock) # define spin_unlock_irq(lock) _spin_unlock_irq(lock)
# define read_unlock_irq(lock) _read_unlock_irq(lock)
# define write_unlock_irq(lock) _write_unlock_irq(lock)
#else #else
# define spin_unlock(lock) \ # define spin_unlock(lock) \
do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0) do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define read_unlock(lock) \
do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define write_unlock(lock) \
do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define spin_unlock_irq(lock) \ # define spin_unlock_irq(lock) \
do { \ do { \
__raw_spin_unlock(&(lock)->raw_lock); \ __raw_spin_unlock(&(lock)->raw_lock); \
__release(lock); \ __release(lock); \
local_irq_enable(); \ local_irq_enable(); \
} while (0) } while (0)
# define read_unlock_irq(lock) \
do { \
__raw_read_unlock(&(lock)->raw_lock); \
__release(lock); \
local_irq_enable(); \
} while (0)
# define write_unlock_irq(lock) \
do { \
__raw_write_unlock(&(lock)->raw_lock); \
__release(lock); \
local_irq_enable(); \
} while (0)
#endif #endif
#define spin_unlock_irqrestore(lock, flags) \ #define spin_unlock_irqrestore(lock, flags) \
...@@ -320,20 +235,6 @@ do { \ ...@@ -320,20 +235,6 @@ do { \
} while (0) } while (0)
#define spin_unlock_bh(lock) _spin_unlock_bh(lock) #define spin_unlock_bh(lock) _spin_unlock_bh(lock)
#define read_unlock_irqrestore(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_read_unlock_irqrestore(lock, flags); \
} while (0)
#define read_unlock_bh(lock) _read_unlock_bh(lock)
#define write_unlock_irqrestore(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_write_unlock_irqrestore(lock, flags); \
} while (0)
#define write_unlock_bh(lock) _write_unlock_bh(lock)
#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock)) #define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
#define spin_trylock_irq(lock) \ #define spin_trylock_irq(lock) \
...@@ -350,13 +251,6 @@ do { \ ...@@ -350,13 +251,6 @@ do { \
1 : ({ local_irq_restore(flags); 0; }); \ 1 : ({ local_irq_restore(flags); 0; }); \
}) })
#define write_trylock_irqsave(lock, flags) \
({ \
local_irq_save(flags); \
write_trylock(lock) ? \
1 : ({ local_irq_restore(flags); 0; }); \
})
/* /*
* Pull the atomic_t declaration: * Pull the atomic_t declaration:
* (asm-mips/atomic.h needs above definitions) * (asm-mips/atomic.h needs above definitions)
...@@ -380,4 +274,6 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock); ...@@ -380,4 +274,6 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
*/ */
#define spin_can_lock(lock) (!spin_is_locked(lock)) #define spin_can_lock(lock) (!spin_is_locked(lock))
#include <linux/rwlock.h>
#endif /* __LINUX_SPINLOCK_H */ #endif /* __LINUX_SPINLOCK_H */
include/linux/spinlock_types.h
View file @ f7c0160a
...@@ -33,22 +33,6 @@ typedef struct { ...@@ -33,22 +33,6 @@ typedef struct {
#define SPINLOCK_MAGIC 0xdead4ead #define SPINLOCK_MAGIC 0xdead4ead
typedef struct {
raw_rwlock_t raw_lock;
#ifdef CONFIG_GENERIC_LOCKBREAK
unsigned int break_lock;
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
unsigned int magic, owner_cpu;
void *owner;
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif
} rwlock_t;
#define RWLOCK_MAGIC 0xdeaf1eed
#define SPINLOCK_OWNER_INIT ((void *)-1L) #define SPINLOCK_OWNER_INIT ((void *)-1L)
#ifdef CONFIG_DEBUG_LOCK_ALLOC #ifdef CONFIG_DEBUG_LOCK_ALLOC
...@@ -57,12 +41,6 @@ typedef struct { ...@@ -57,12 +41,6 @@ typedef struct {
# define SPIN_DEP_MAP_INIT(lockname) # define SPIN_DEP_MAP_INIT(lockname)
#endif #endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
#else
# define RW_DEP_MAP_INIT(lockname)
#endif
#ifdef CONFIG_DEBUG_SPINLOCK #ifdef CONFIG_DEBUG_SPINLOCK
# define __SPIN_LOCK_UNLOCKED(lockname) \ # define __SPIN_LOCK_UNLOCKED(lockname) \
(spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \
...@@ -70,31 +48,22 @@ typedef struct { ...@@ -70,31 +48,22 @@ typedef struct {
.owner = SPINLOCK_OWNER_INIT, \ .owner = SPINLOCK_OWNER_INIT, \
.owner_cpu = -1, \ .owner_cpu = -1, \
SPIN_DEP_MAP_INIT(lockname) } SPIN_DEP_MAP_INIT(lockname) }
#define __RW_LOCK_UNLOCKED(lockname) \
(rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \
.magic = RWLOCK_MAGIC, \
.owner = SPINLOCK_OWNER_INIT, \
.owner_cpu = -1, \
RW_DEP_MAP_INIT(lockname) }
#else #else
# define __SPIN_LOCK_UNLOCKED(lockname) \ # define __SPIN_LOCK_UNLOCKED(lockname) \
(spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \ (spinlock_t) { .raw_lock = __RAW_SPIN_LOCK_UNLOCKED, \
SPIN_DEP_MAP_INIT(lockname) } SPIN_DEP_MAP_INIT(lockname) }
#define __RW_LOCK_UNLOCKED(lockname) \
(rwlock_t) { .raw_lock = __RAW_RW_LOCK_UNLOCKED, \
RW_DEP_MAP_INIT(lockname) }
#endif #endif
/* /*
* SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and * SPIN_LOCK_UNLOCKED defeats lockdep state tracking and is hence
* are hence deprecated. * deprecated.
* Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or * Please use DEFINE_SPINLOCK() or __SPIN_LOCK_UNLOCKED() as
* __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate. * appropriate.
*/ */
#define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init) #define SPIN_LOCK_UNLOCKED __SPIN_LOCK_UNLOCKED(old_style_spin_init)
#define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init)
#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x) #define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
#include <linux/rwlock_types.h>
#endif /* __LINUX_SPINLOCK_TYPES_H */ #endif /* __LINUX_SPINLOCK_TYPES_H */
kernel/Makefile
View file @ f7c0160a
...@@ -45,9 +45,9 @@ obj-$(CONFIG_USE_GENERIC_SMP_HELPERS) += smp.o ...@@ -45,9 +45,9 @@ obj-$(CONFIG_USE_GENERIC_SMP_HELPERS) += smp.o
ifneq ($(CONFIG_SMP),y) ifneq ($(CONFIG_SMP),y)
obj-y += up.o obj-y += up.o
endif endif
obj-$(CONFIG_SMP) += spinlock.o obj-$(CONFIG_SMP) += spinlock.o rwlock.o
obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o rwlock.o
obj-$(CONFIG_PROVE_LOCKING) += spinlock.o obj-$(CONFIG_PROVE_LOCKING) += spinlock.o rwlock.o
obj-$(CONFIG_UID16) += uid16.o obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o obj-$(CONFIG_KALLSYMS) += kallsyms.o
......
kernel/lock-internals.h 0 → 100644
View file @ f7c0160a
/*
* Macros shared by spinlock.c and rwlock.c
*/
/*
* This could be a long-held lock. We both prepare to spin for a long
* time (making _this_ CPU preemptable if possible), and we also signal
* towards that other CPU that it should break the lock ASAP.
*
* (We do this in a function because inlining it would be excessive.)
*/
#define BUILD_LOCK_OPS(op, locktype) \
void __lockfunc _##op##_lock(locktype##_t *lock) \
{ \
for (;;) { \
preempt_disable(); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
preempt_enable(); \
\
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
_raw_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
} \
\
EXPORT_SYMBOL(_##op##_lock); \
\
unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
{ \
unsigned long flags; \
\
for (;;) { \
preempt_disable(); \
local_irq_save(flags); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
local_irq_restore(flags); \
preempt_enable(); \
\
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
_raw_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
return flags; \
} \
\
EXPORT_SYMBOL(_##op##_lock_irqsave); \
\
void __lockfunc _##op##_lock_irq(locktype##_t *lock) \
{ \
_##op##_lock_irqsave(lock); \
} \
\
EXPORT_SYMBOL(_##op##_lock_irq); \
\
void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
{ \
unsigned long flags; \
\
/* */ \
/* Careful: we must exclude softirqs too, hence the */ \
/* irq-disabling. We use the generic preemption-aware */ \
/* function: */ \
/**/ \
flags = _##op##_lock_irqsave(lock); \
local_bh_disable(); \
local_irq_restore(flags); \
} \
\
EXPORT_SYMBOL(_##op##_lock_bh)
kernel/rwlock.c 0 → 100644
View file @ f7c0160a
/*
* Copyright (2004) Linus Torvalds
*
* Author: Zwane Mwaikambo <zwane@fsmlabs.com>
*
* Copyright (2004, 2005) Ingo Molnar
*
* This file contains the spinlock/rwlock implementations for the
* SMP and the DEBUG_SPINLOCK cases. (UP-nondebug inlines them)
*
* Note that some architectures have special knowledge about the
* stack frames of these functions in their profile_pc. If you
* change anything significant here that could change the stack
* frame contact the architecture maintainers.
*/
#include <linux/linkage.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/debug_locks.h>
#include <linux/module.h>
#include "lock-internals.h"
int __lockfunc _read_trylock(rwlock_t *lock)
{
preempt_disable();
if (_raw_read_trylock(lock)) {
rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
}
preempt_enable();
return 0;
}
EXPORT_SYMBOL(_read_trylock);
int __lockfunc _write_trylock(rwlock_t *lock)
{
preempt_disable();
if (_raw_write_trylock(lock)) {
rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
}
preempt_enable();
return 0;
}
EXPORT_SYMBOL(_write_trylock);
/*
* If lockdep is enabled then we use the non-preemption spin-ops
* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
* not re-enabled during lock-acquire (which the preempt-spin-ops do):
*/
#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
void __lockfunc _read_lock(rwlock_t *lock)
{
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}
EXPORT_SYMBOL(_read_lock);
unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
{
unsigned long flags;
local_irq_save(flags);
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
_raw_read_lock_flags, &flags);
return flags;
}
EXPORT_SYMBOL(_read_lock_irqsave);
void __lockfunc _read_lock_irq(rwlock_t *lock)
{
local_irq_disable();
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}
EXPORT_SYMBOL(_read_lock_irq);
void __lockfunc _read_lock_bh(rwlock_t *lock)
{
local_bh_disable();
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}
EXPORT_SYMBOL(_read_lock_bh);
unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
{
unsigned long flags;
local_irq_save(flags);
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
_raw_write_lock_flags, &flags);
return flags;
}
EXPORT_SYMBOL(_write_lock_irqsave);
void __lockfunc _write_lock_irq(rwlock_t *lock)
{
local_irq_disable();
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}
EXPORT_SYMBOL(_write_lock_irq);
void __lockfunc _write_lock_bh(rwlock_t *lock)
{
local_bh_disable();
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}
EXPORT_SYMBOL(_write_lock_bh);
void __lockfunc _write_lock(rwlock_t *lock)
{
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}
EXPORT_SYMBOL(_write_lock);
#else /* CONFIG_PREEMPT: */
/*
* Build preemption-friendly versions of the following
* lock-spinning functions:
*
* _[read|write]_lock()
* _[read|write]_lock_irq()
* _[read|write]_lock_irqsave()
* _[read|write]_lock_bh()
*/
BUILD_LOCK_OPS(read, rwlock);
BUILD_LOCK_OPS(write, rwlock);
#endif /* CONFIG_PREEMPT */
void __lockfunc _write_unlock(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
preempt_enable();
}
EXPORT_SYMBOL(_write_unlock);
void __lockfunc _read_unlock(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
preempt_enable();
}
EXPORT_SYMBOL(_read_unlock);
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
local_irq_restore(flags);
preempt_enable();
}
EXPORT_SYMBOL(_read_unlock_irqrestore);
void __lockfunc _read_unlock_irq(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
local_irq_enable();
preempt_enable();
}
EXPORT_SYMBOL(_read_unlock_irq);
void __lockfunc _read_unlock_bh(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
preempt_enable_no_resched();
local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_read_unlock_bh);
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
local_irq_restore(flags);
preempt_enable();
}
EXPORT_SYMBOL(_write_unlock_irqrestore);
void __lockfunc _write_unlock_irq(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
local_irq_enable();
preempt_enable();
}
EXPORT_SYMBOL(_write_unlock_irq);
void __lockfunc _write_unlock_bh(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
preempt_enable_no_resched();
local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_write_unlock_bh);
kernel/spinlock.c
View file @ f7c0160a
...@@ -21,6 +21,8 @@ ...@@ -21,6 +21,8 @@
#include <linux/debug_locks.h> #include <linux/debug_locks.h>
#include <linux/module.h> #include <linux/module.h>
#include "lock-internals.h"
int __lockfunc _spin_trylock(spinlock_t *lock) int __lockfunc _spin_trylock(spinlock_t *lock)
{ {
preempt_disable(); preempt_disable();
...@@ -28,38 +30,11 @@ int __lockfunc _spin_trylock(spinlock_t *lock) ...@@ -28,38 +30,11 @@ int __lockfunc _spin_trylock(spinlock_t *lock)
spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
return 1; return 1;
} }
preempt_enable(); preempt_enable();
return 0; return 0;
} }
EXPORT_SYMBOL(_spin_trylock); EXPORT_SYMBOL(_spin_trylock);
int __lockfunc _read_trylock(rwlock_t *lock)
{
preempt_disable();
if (_raw_read_trylock(lock)) {
rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
}
preempt_enable();
return 0;
}
EXPORT_SYMBOL(_read_trylock);
int __lockfunc _write_trylock(rwlock_t *lock)
{
preempt_disable();
if (_raw_write_trylock(lock)) {
rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
return 1;
}
preempt_enable();
return 0;
}
EXPORT_SYMBOL(_write_trylock);
/* /*
* If lockdep is enabled then we use the non-preemption spin-ops * If lockdep is enabled then we use the non-preemption spin-ops
* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
...@@ -67,14 +42,6 @@ EXPORT_SYMBOL(_write_trylock); ...@@ -67,14 +42,6 @@ EXPORT_SYMBOL(_write_trylock);
*/ */
#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC) #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
void __lockfunc _read_lock(rwlock_t *lock)
{
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}
EXPORT_SYMBOL(_read_lock);
unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
{ {
unsigned long flags; unsigned long flags;
...@@ -114,173 +81,26 @@ void __lockfunc _spin_lock_bh(spinlock_t *lock) ...@@ -114,173 +81,26 @@ void __lockfunc _spin_lock_bh(spinlock_t *lock)
} }
EXPORT_SYMBOL(_spin_lock_bh); EXPORT_SYMBOL(_spin_lock_bh);
unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
{
unsigned long flags;
local_irq_save(flags);
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
_raw_read_lock_flags, &flags);
return flags;
}
EXPORT_SYMBOL(_read_lock_irqsave);
void __lockfunc _read_lock_irq(rwlock_t *lock)
{
local_irq_disable();
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}
EXPORT_SYMBOL(_read_lock_irq);
void __lockfunc _read_lock_bh(rwlock_t *lock)
{
local_bh_disable();
preempt_disable();
rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
}
EXPORT_SYMBOL(_read_lock_bh);
unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
{
unsigned long flags;
local_irq_save(flags);
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
_raw_write_lock_flags, &flags);
return flags;
}
EXPORT_SYMBOL(_write_lock_irqsave);
void __lockfunc _write_lock_irq(rwlock_t *lock)
{
local_irq_disable();
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}
EXPORT_SYMBOL(_write_lock_irq);
void __lockfunc _write_lock_bh(rwlock_t *lock)
{
local_bh_disable();
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}
EXPORT_SYMBOL(_write_lock_bh);
void __lockfunc _spin_lock(spinlock_t *lock) void __lockfunc _spin_lock(spinlock_t *lock)
{ {
preempt_disable(); preempt_disable();
spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
} }
EXPORT_SYMBOL(_spin_lock); EXPORT_SYMBOL(_spin_lock);
void __lockfunc _write_lock(rwlock_t *lock)
{
preempt_disable();
rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
}
EXPORT_SYMBOL(_write_lock);
#else /* CONFIG_PREEMPT: */ #else /* CONFIG_PREEMPT: */
/*
* This could be a long-held lock. We both prepare to spin for a long
* time (making _this_ CPU preemptable if possible), and we also signal
* towards that other CPU that it should break the lock ASAP.
*
* (We do this in a function because inlining it would be excessive.)
*/
#define BUILD_LOCK_OPS(op, locktype) \
void __lockfunc _##op##_lock(locktype##_t *lock) \
{ \
for (;;) { \
preempt_disable(); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
preempt_enable(); \
\
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
_raw_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
} \
\
EXPORT_SYMBOL(_##op##_lock); \
\
unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \
{ \
unsigned long flags; \
\
for (;;) { \
preempt_disable(); \
local_irq_save(flags); \
if (likely(_raw_##op##_trylock(lock))) \
break; \
local_irq_restore(flags); \
preempt_enable(); \
\
if (!(lock)->break_lock) \
(lock)->break_lock = 1; \
while (!op##_can_lock(lock) && (lock)->break_lock) \
_raw_##op##_relax(&lock->raw_lock); \
} \
(lock)->break_lock = 0; \
return flags; \
} \
\
EXPORT_SYMBOL(_##op##_lock_irqsave); \
\
void __lockfunc _##op##_lock_irq(locktype##_t *lock) \
{ \
_##op##_lock_irqsave(lock); \
} \
\
EXPORT_SYMBOL(_##op##_lock_irq); \
\
void __lockfunc _##op##_lock_bh(locktype##_t *lock) \
{ \
unsigned long flags; \
\
/* */ \
/* Careful: we must exclude softirqs too, hence the */ \
/* irq-disabling. We use the generic preemption-aware */ \
/* function: */ \
/**/ \
flags = _##op##_lock_irqsave(lock); \
local_bh_disable(); \
local_irq_restore(flags); \
} \
\
EXPORT_SYMBOL(_##op##_lock_bh)
/* /*
* Build preemption-friendly versions of the following * Build preemption-friendly versions of the following
* lock-spinning functions: * lock-spinning functions:
* *
* _[spin|read|write]_lock() * _spin_lock()
* _[spin|read|write]_lock_irq() * _spin_lock_irq()
* _[spin|read|write]_lock_irqsave() * _spin_lock_irqsave()
* _[spin|read|write]_lock_bh() * _spin_lock_bh()
*/ */
BUILD_LOCK_OPS(spin, spinlock); BUILD_LOCK_OPS(spin, spinlock);
BUILD_LOCK_OPS(read, rwlock);
BUILD_LOCK_OPS(write, rwlock);
#endif /* CONFIG_PREEMPT */ #endif /* CONFIG_PREEMPT */
...@@ -326,22 +146,6 @@ void __lockfunc _spin_unlock(spinlock_t *lock) ...@@ -326,22 +146,6 @@ void __lockfunc _spin_unlock(spinlock_t *lock)
} }
EXPORT_SYMBOL(_spin_unlock); EXPORT_SYMBOL(_spin_unlock);
void __lockfunc _write_unlock(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
preempt_enable();
}
EXPORT_SYMBOL(_write_unlock);
void __lockfunc _read_unlock(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
preempt_enable();
}
EXPORT_SYMBOL(_read_unlock);
void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{ {
spin_release(&lock->dep_map, 1, _RET_IP_); spin_release(&lock->dep_map, 1, _RET_IP_);
...@@ -369,60 +173,6 @@ void __lockfunc _spin_unlock_bh(spinlock_t *lock) ...@@ -369,60 +173,6 @@ void __lockfunc _spin_unlock_bh(spinlock_t *lock)
} }
EXPORT_SYMBOL(_spin_unlock_bh); EXPORT_SYMBOL(_spin_unlock_bh);
void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
local_irq_restore(flags);
preempt_enable();
}
EXPORT_SYMBOL(_read_unlock_irqrestore);
void __lockfunc _read_unlock_irq(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
local_irq_enable();
preempt_enable();
}
EXPORT_SYMBOL(_read_unlock_irq);
void __lockfunc _read_unlock_bh(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_read_unlock(lock);
preempt_enable_no_resched();
local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_read_unlock_bh);
void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
local_irq_restore(flags);
preempt_enable();
}
EXPORT_SYMBOL(_write_unlock_irqrestore);
void __lockfunc _write_unlock_irq(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
local_irq_enable();
preempt_enable();
}
EXPORT_SYMBOL(_write_unlock_irq);
void __lockfunc _write_unlock_bh(rwlock_t *lock)
{
rwlock_release(&lock->dep_map, 1, _RET_IP_);
_raw_write_unlock(lock);
preempt_enable_no_resched();
local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
EXPORT_SYMBOL(_write_unlock_bh);
int __lockfunc _spin_trylock_bh(spinlock_t *lock) int __lockfunc _spin_trylock_bh(spinlock_t *lock)
{ {
local_bh_disable(); local_bh_disable();
......
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