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_LABEL(spin_label, continue_label) \ 12 spin_label 13 14#define BACKOFF_SPIN(reg, tmp, label) \ 15 mov reg, tmp; \ 1688: brnz,pt tmp, 88b; \ 17 sub tmp, 1, tmp; \ 18 set BACKOFF_LIMIT, tmp; \ 19 cmp reg, tmp; \ 20 bg,pn %xcc, label; \ 21 nop; \ 22 ba,pt %xcc, label; \ 23 sllx reg, 1, reg; 24 25#else 26 27#define BACKOFF_SETUP(reg) 28 29#define BACKOFF_LABEL(spin_label, continue_label) \ 30 continue_label 31 32#define BACKOFF_SPIN(reg, tmp, label) 33 34#endif 35 36#endif /* _SPARC64_BACKOFF_H */ 37