aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/spinlock.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm/spinlock.h')
-rw-r--r--arch/x86/include/asm/spinlock.h37
1 files changed, 22 insertions, 15 deletions
diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index 3089f70c0c52..e9e51f710e6c 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -2,7 +2,6 @@
#define _ASM_X86_SPINLOCK_H
#include <asm/atomic.h>
-#include <asm/rwlock.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <linux/compiler.h>
@@ -234,7 +233,7 @@ static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
*/
static inline int arch_read_can_lock(arch_rwlock_t *lock)
{
- return (int)(lock)->lock > 0;
+ return lock->lock > 0;
}
/**
@@ -243,12 +242,12 @@ static inline int arch_read_can_lock(arch_rwlock_t *lock)
*/
static inline int arch_write_can_lock(arch_rwlock_t *lock)
{
- return (lock)->lock == RW_LOCK_BIAS;
+ return lock->write == WRITE_LOCK_CMP;
}
static inline void arch_read_lock(arch_rwlock_t *rw)
{
- asm volatile(LOCK_PREFIX " subl $1,(%0)\n\t"
+ asm volatile(LOCK_PREFIX READ_LOCK_SIZE(dec) " (%0)\n\t"
"jns 1f\n"
"call __read_lock_failed\n\t"
"1:\n"
@@ -257,47 +256,55 @@ static inline void arch_read_lock(arch_rwlock_t *rw)
static inline void arch_write_lock(arch_rwlock_t *rw)
{
- asm volatile(LOCK_PREFIX " subl %1,(%0)\n\t"
+ asm volatile(LOCK_PREFIX WRITE_LOCK_SUB(%1) "(%0)\n\t"
"jz 1f\n"
"call __write_lock_failed\n\t"
"1:\n"
- ::LOCK_PTR_REG (rw), "i" (RW_LOCK_BIAS) : "memory");
+ ::LOCK_PTR_REG (&rw->write), "i" (RW_LOCK_BIAS)
+ : "memory");
}
static inline int arch_read_trylock(arch_rwlock_t *lock)
{
- atomic_t *count = (atomic_t *)lock;
+ READ_LOCK_ATOMIC(t) *count = (READ_LOCK_ATOMIC(t) *)lock;
- if (atomic_dec_return(count) >= 0)
+ if (READ_LOCK_ATOMIC(dec_return)(count) >= 0)
return 1;
- atomic_inc(count);
+ READ_LOCK_ATOMIC(inc)(count);
return 0;
}
static inline int arch_write_trylock(arch_rwlock_t *lock)
{
- atomic_t *count = (atomic_t *)lock;
+ atomic_t *count = (atomic_t *)&lock->write;
- if (atomic_sub_and_test(RW_LOCK_BIAS, count))
+ if (atomic_sub_and_test(WRITE_LOCK_CMP, count))
return 1;
- atomic_add(RW_LOCK_BIAS, count);
+ atomic_add(WRITE_LOCK_CMP, count);
return 0;
}
static inline void arch_read_unlock(arch_rwlock_t *rw)
{
- asm volatile(LOCK_PREFIX "incl %0" :"+m" (rw->lock) : : "memory");
+ asm volatile(LOCK_PREFIX READ_LOCK_SIZE(inc) " %0"
+ :"+m" (rw->lock) : : "memory");
}
static inline void arch_write_unlock(arch_rwlock_t *rw)
{
- asm volatile(LOCK_PREFIX "addl %1, %0"
- : "+m" (rw->lock) : "i" (RW_LOCK_BIAS) : "memory");
+ asm volatile(LOCK_PREFIX WRITE_LOCK_ADD(%1) "%0"
+ : "+m" (rw->write) : "i" (RW_LOCK_BIAS) : "memory");
}
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+#undef READ_LOCK_SIZE
+#undef READ_LOCK_ATOMIC
+#undef WRITE_LOCK_ADD
+#undef WRITE_LOCK_SUB
+#undef WRITE_LOCK_CMP
+
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()