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Diffstat (limited to 'arch/x86/include/asm/spinlock.h')
-rw-r--r--arch/x86/include/asm/spinlock.h69
1 files changed, 3 insertions, 66 deletions
diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index d17c91981da..139b4249a5e 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -172,70 +172,8 @@ static inline int __ticket_spin_is_contended(raw_spinlock_t *lock)
return (((tmp >> TICKET_SHIFT) - tmp) & ((1 << TICKET_SHIFT) - 1)) > 1;
}
-#ifdef CONFIG_PARAVIRT
-/*
- * Define virtualization-friendly old-style lock byte lock, for use in
- * pv_lock_ops if desired.
- *
- * This differs from the pre-2.6.24 spinlock by always using xchgb
- * rather than decb to take the lock; this allows it to use a
- * zero-initialized lock structure. It also maintains a 1-byte
- * contention counter, so that we can implement
- * __byte_spin_is_contended.
- */
-struct __byte_spinlock {
- s8 lock;
- s8 spinners;
-};
-
-static inline int __byte_spin_is_locked(raw_spinlock_t *lock)
-{
- struct __byte_spinlock *bl = (struct __byte_spinlock *)lock;
- return bl->lock != 0;
-}
-
-static inline int __byte_spin_is_contended(raw_spinlock_t *lock)
-{
- struct __byte_spinlock *bl = (struct __byte_spinlock *)lock;
- return bl->spinners != 0;
-}
-
-static inline void __byte_spin_lock(raw_spinlock_t *lock)
-{
- struct __byte_spinlock *bl = (struct __byte_spinlock *)lock;
- s8 val = 1;
-
- asm("1: xchgb %1, %0\n"
- " test %1,%1\n"
- " jz 3f\n"
- " " LOCK_PREFIX "incb %2\n"
- "2: rep;nop\n"
- " cmpb $1, %0\n"
- " je 2b\n"
- " " LOCK_PREFIX "decb %2\n"
- " jmp 1b\n"
- "3:"
- : "+m" (bl->lock), "+q" (val), "+m" (bl->spinners): : "memory");
-}
-
-static inline int __byte_spin_trylock(raw_spinlock_t *lock)
-{
- struct __byte_spinlock *bl = (struct __byte_spinlock *)lock;
- u8 old = 1;
-
- asm("xchgb %1,%0"
- : "+m" (bl->lock), "+q" (old) : : "memory");
+#ifndef CONFIG_PARAVIRT
- return old == 0;
-}
-
-static inline void __byte_spin_unlock(raw_spinlock_t *lock)
-{
- struct __byte_spinlock *bl = (struct __byte_spinlock *)lock;
- smp_wmb();
- bl->lock = 0;
-}
-#else /* !CONFIG_PARAVIRT */
static inline int __raw_spin_is_locked(raw_spinlock_t *lock)
{
return __ticket_spin_is_locked(lock);
@@ -267,7 +205,7 @@ static __always_inline void __raw_spin_lock_flags(raw_spinlock_t *lock,
__raw_spin_lock(lock);
}
-#endif /* CONFIG_PARAVIRT */
+#endif
static inline void __raw_spin_unlock_wait(raw_spinlock_t *lock)
{
@@ -329,8 +267,7 @@ static inline int __raw_read_trylock(raw_rwlock_t *lock)
{
atomic_t *count = (atomic_t *)lock;
- atomic_dec(count);
- if (atomic_read(count) >= 0)
+ if (atomic_dec_return(count) >= 0)
return 1;
atomic_inc(count);
return 0;