| 249 |
|
} |
| 250 |
|
#endif |
| 251 |
|
|
| 252 |
< |
#ifdef __i386__ |
| 252 |
> |
#if defined(__i386__) || defined(__x86_64__) |
| 253 |
|
#define HAVE_TEST_AND_SET 1 |
| 254 |
|
static inline int testandset(volatile int *p) |
| 255 |
|
{ |
| 256 |
< |
int ret; |
| 257 |
< |
long int readval; |
| 256 |
> |
long int ret; |
| 257 |
|
/* Note: the "xchg" instruction does not need a "lock" prefix */ |
| 258 |
< |
__asm__ __volatile__("xchgl %0, %1" |
| 259 |
< |
: "=r" (ret), "=m" (*p), "=a" (readval) |
| 258 |
> |
__asm__ __volatile__("xchgl %k0, %1" |
| 259 |
> |
: "=r" (ret), "=m" (*p) |
| 260 |
|
: "0" (1), "m" (*p) |
| 261 |
|
: "memory"); |
| 262 |
|
return ret; |
