diff options
Diffstat (limited to 'linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/synch_bitops.h')
| -rw-r--r-- | linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/synch_bitops.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/synch_bitops.h b/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/synch_bitops.h index 6af3ad2857..11f88c2507 100644 --- a/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/synch_bitops.h +++ b/linux-2.6.11-xen-sparse/include/asm-xen/asm-i386/synch_bitops.h @@ -89,6 +89,22 @@ static inline unsigned long __synch_cmpxchg(volatile void *ptr, "0"(old) : "memory"); return prev; +#ifdef CONFIG_X86_64 + case 4: + __asm__ __volatile__("lock; cmpxchgl %k1,%2" + : "=a"(prev) + : "q"(new), "m"(*__synch_xg(ptr)), + "0"(old) + : "memory"); + return prev; + case 8: + __asm__ __volatile__("lock; cmpxchgq %1,%2" + : "=a"(prev) + : "q"(new), "m"(*__synch_xg(ptr)), + "0"(old) + : "memory"); + return prev; +#else case 4: __asm__ __volatile__("lock; cmpxchgl %1,%2" : "=a"(prev) @@ -96,6 +112,7 @@ static inline unsigned long __synch_cmpxchg(volatile void *ptr, "0"(old) : "memory"); return prev; +#endif } return old; } |