| Mathieu Desnoyers | 068fbad | 2008-02-07 00:16:07 -0800 | [diff] [blame^] | 1 | #ifndef __ASM_GENERIC_CMPXCHG_H |
| 2 | #define __ASM_GENERIC_CMPXCHG_H |
| 3 | |
| 4 | /* |
| 5 | * Generic cmpxchg |
| 6 | * |
| 7 | * Uses the local cmpxchg. Does not support SMP. |
| 8 | */ |
| 9 | #ifdef CONFIG_SMP |
| 10 | #error "Cannot use generic cmpxchg on SMP" |
| 11 | #endif |
| 12 | |
| 13 | /* |
| 14 | * Atomic compare and exchange. |
| 15 | * |
| 16 | * Do not define __HAVE_ARCH_CMPXCHG because we want to use it to check whether |
| 17 | * a cmpxchg primitive faster than repeated local irq save/restore exists. |
| 18 | */ |
| 19 | #define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n)) |
| 20 | #define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n)) |
| 21 | |
| 22 | #endif |