diff options
Diffstat (limited to 'tools/include/asm-generic/atomic-gcc.h')
| -rw-r--r-- | tools/include/asm-generic/atomic-gcc.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/include/asm-generic/atomic-gcc.h b/tools/include/asm-generic/atomic-gcc.h index 37ef522aaac4..9b3c528bab92 100644 --- a/tools/include/asm-generic/atomic-gcc.h +++ b/tools/include/asm-generic/atomic-gcc.h @@ -81,4 +81,15 @@ static inline int test_and_set_bit(long nr, unsigned long *addr) return !!(old & mask); } +static inline int test_and_clear_bit(long nr, unsigned long *addr) +{ + unsigned long mask = BIT_MASK(nr); + long old; + + addr += BIT_WORD(nr); + + old = __sync_fetch_and_and(addr, ~mask); + return !!(old & mask); +} + #endif /* __TOOLS_ASM_GENERIC_ATOMIC_H */ |