From b8dc93cbe91324b922395919cd5df4cca2fe55f6 Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Thu, 18 Oct 2007 03:06:54 -0700 Subject: [PATCH] bit_spin_lock: use lock bitops Convert bit_spin_lock to new locking bitops. Slub can use the non-atomic store version to clear (Christoph?) Signed-off-by: Nick Piggin Cc: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/bit_spinlock.h | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/include/linux/bit_spinlock.h b/include/linux/bit_spinlock.h index 6b20af0bbb79..7113a32a86ea 100644 --- a/include/linux/bit_spinlock.h +++ b/include/linux/bit_spinlock.h @@ -18,7 +18,7 @@ static inline void bit_spin_lock(int bitnum, unsigned long *addr) */ preempt_disable(); #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - while (test_and_set_bit(bitnum, addr)) { + while (unlikely(test_and_set_bit_lock(bitnum, addr))) { while (test_bit(bitnum, addr)) { preempt_enable(); cpu_relax(); @@ -36,7 +36,7 @@ static inline int bit_spin_trylock(int bitnum, unsigned long *addr) { preempt_disable(); #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) - if (test_and_set_bit(bitnum, addr)) { + if (unlikely(test_and_set_bit_lock(bitnum, addr))) { preempt_enable(); return 0; } @@ -50,10 +50,28 @@ static inline int bit_spin_trylock(int bitnum, unsigned long *addr) */ static inline void bit_spin_unlock(int bitnum, unsigned long *addr) { +#ifdef CONFIG_DEBUG_SPINLOCK + BUG_ON(!test_bit(bitnum, addr)); +#endif #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) + clear_bit_unlock(bitnum, addr); +#endif + preempt_enable(); + __release(bitlock); +} + +/* + * bit-based spin_unlock() + * non-atomic version, which can be used eg. if the bit lock itself is + * protecting the rest of the flags in the word. + */ +static inline void __bit_spin_unlock(int bitnum, unsigned long *addr) +{ +#ifdef CONFIG_DEBUG_SPINLOCK BUG_ON(!test_bit(bitnum, addr)); - smp_mb__before_clear_bit(); - clear_bit(bitnum, addr); +#endif +#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) + __clear_bit_unlock(bitnum, addr); #endif preempt_enable(); __release(bitlock); -- 2.20.1