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authorLinus Torvalds <torvalds@linux-foundation.org>2008-05-10 19:52:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-10 19:52:43 -0700
commit39f004ba27fcd2431030a3bb3c949fa3f93fa4ca (patch)
treeddb97fc877f0cf4bd2424a75745661eb97346b00
parent9c3cdc1f83a6e07092392ff4aba6466517dbd1d0 (diff)
Make <asm-x86/spinlock.h> use ACCESS_ONCE()
..instead of cooking up its own uglier local version of it. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/asm-x86/spinlock.h18
1 files changed, 4 insertions, 14 deletions
diff --git a/include/asm-x86/spinlock.h b/include/asm-x86/spinlock.h
index bc6376f1bc5..21e89bf92f1 100644
--- a/include/asm-x86/spinlock.h
+++ b/include/asm-x86/spinlock.h
@@ -20,18 +20,8 @@
*/
#ifdef CONFIG_X86_32
-typedef char _slock_t;
-# define LOCK_INS_DEC "decb"
-# define LOCK_INS_XCH "xchgb"
-# define LOCK_INS_MOV "movb"
-# define LOCK_INS_CMP "cmpb"
# define LOCK_PTR_REG "a"
#else
-typedef int _slock_t;
-# define LOCK_INS_DEC "decl"
-# define LOCK_INS_XCH "xchgl"
-# define LOCK_INS_MOV "movl"
-# define LOCK_INS_CMP "cmpl"
# define LOCK_PTR_REG "D"
#endif
@@ -66,14 +56,14 @@ typedef int _slock_t;
#if (NR_CPUS < 256)
static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
{
- int tmp = *(volatile signed int *)(&(lock)->slock);
+ int tmp = ACCESS_ONCE(lock->slock);
return (((tmp >> 8) & 0xff) != (tmp & 0xff));
}
static inline int __raw_spin_is_contended(raw_spinlock_t *lock)
{
- int tmp = *(volatile signed int *)(&(lock)->slock);
+ int tmp = ACCESS_ONCE(lock->slock);
return (((tmp >> 8) & 0xff) - (tmp & 0xff)) > 1;
}
@@ -130,14 +120,14 @@ static __always_inline void __raw_spin_unlock(raw_spinlock_t *lock)
#else
static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
{
- int tmp = *(volatile signed int *)(&(lock)->slock);
+ int tmp = ACCESS_ONCE(lock->slock);
return (((tmp >> 16) & 0xffff) != (tmp & 0xffff));
}
static inline int __raw_spin_is_contended(raw_spinlock_t *lock)
{
- int tmp = *(volatile signed int *)(&(lock)->slock);
+ int tmp = ACCESS_ONCE(lock->slock);
return (((tmp >> 16) & 0xffff) - (tmp & 0xffff)) > 1;
}