diff options
Diffstat (limited to 'include/asm-ia64/bitops.h')
| -rw-r--r-- | include/asm-ia64/bitops.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/include/asm-ia64/bitops.h b/include/asm-ia64/bitops.h index 6cc517e212a..a977affaebe 100644 --- a/include/asm-ia64/bitops.h +++ b/include/asm-ia64/bitops.h @@ -9,6 +9,10 @@ * O(1) scheduler patch */ +#ifndef _LINUX_BITOPS_H +#error only <linux/bitops.h> can be included directly +#endif + #include <linux/compiler.h> #include <linux/types.h> #include <asm/intrinsics.h> @@ -94,6 +98,38 @@ clear_bit (int nr, volatile void *addr) } /** + * clear_bit_unlock - Clears a bit in memory with release + * @nr: Bit to clear + * @addr: Address to start counting from + * + * clear_bit_unlock() is atomic and may not be reordered. It does + * contain a memory barrier suitable for unlock type operations. + */ +static __inline__ void +clear_bit_unlock (int nr, volatile void *addr) +{ + __u32 mask, old, new; + volatile __u32 *m; + CMPXCHG_BUGCHECK_DECL + + m = (volatile __u32 *) addr + (nr >> 5); + mask = ~(1 << (nr & 31)); + do { + CMPXCHG_BUGCHECK(m); + old = *m; + new = old & mask; + } while (cmpxchg_rel(m, old, new) != old); +} + +/** + * __clear_bit_unlock - Non-atomically clear a bit with release + * + * This is like clear_bit_unlock, but the implementation may use a non-atomic + * store (this one uses an atomic, however). + */ +#define __clear_bit_unlock clear_bit_unlock + +/** * __clear_bit - Clears a bit in memory (non-atomic version) */ static __inline__ void @@ -170,6 +206,15 @@ test_and_set_bit (int nr, volatile void *addr) } /** + * test_and_set_bit_lock - Set a bit and return its old value for lock + * @nr: Bit to set + * @addr: Address to count from + * + * This is the same as test_and_set_bit on ia64 + */ +#define test_and_set_bit_lock test_and_set_bit + +/** * __test_and_set_bit - Set a bit and return its old value * @nr: Bit to set * @addr: Address to count from |