projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 24f287e4 DM |
1 | #ifndef _SPARC64_BACKOFF_H |
| 2 | #define _SPARC64_BACKOFF_H | |
| 3 | ||
| 4 | #define BACKOFF_LIMIT (4 * 1024) | |
| 5 | ||
| 6 | #ifdef CONFIG_SMP | |
| 7 | ||
| 8 | #define BACKOFF_SETUP(reg) \ | |
| 9 | mov 1, reg | |
| 10 | ||
| 11 | #define BACKOFF_SPIN(reg, tmp, label) \ | |
| 12 | mov reg, tmp; \ | |
| 13 | 88: brnz,pt tmp, 88b; \ | |
| 14 | sub tmp, 1, tmp; \ | |
| 15 | cmp reg, BACKOFF_LIMIT; \ | |
| 16 | bg,pn %xcc, label; \ | |
| 17 | nop; \ | |
| 18 | ba,pt %xcc, label; \ | |
| 19 | sllx reg, 1, reg; | |
| 20 | ||
| 21 | #else | |
| 22 | ||
| 23 | #define BACKOFF_SETUP(reg) | |
| 0aa031d9 DM |
24 | #define BACKOFF_SPIN(reg, tmp, label) \ |
| 25 | ba,pt %xcc, label; \ | |
| 26 | nop; | |
| 24f287e4 DM |
27 | |
| 28 | #endif | |
| 29 | ||
| 30 | #endif /* _SPARC64_BACKOFF_H */ |