mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
0aa031d9e0
It can't be just empty, it has to at least branch back to 'label'. Signed-off-by: David S. Miller <davem@davemloft.net>
31 lines
497 B
C
31 lines
497 B
C
#ifndef _SPARC64_BACKOFF_H
|
|
#define _SPARC64_BACKOFF_H
|
|
|
|
#define BACKOFF_LIMIT (4 * 1024)
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
#define BACKOFF_SETUP(reg) \
|
|
mov 1, reg
|
|
|
|
#define BACKOFF_SPIN(reg, tmp, label) \
|
|
mov reg, tmp; \
|
|
88: brnz,pt tmp, 88b; \
|
|
sub tmp, 1, tmp; \
|
|
cmp reg, BACKOFF_LIMIT; \
|
|
bg,pn %xcc, label; \
|
|
nop; \
|
|
ba,pt %xcc, label; \
|
|
sllx reg, 1, reg;
|
|
|
|
#else
|
|
|
|
#define BACKOFF_SETUP(reg)
|
|
#define BACKOFF_SPIN(reg, tmp, label) \
|
|
ba,pt %xcc, label; \
|
|
nop;
|
|
|
|
#endif
|
|
|
|
#endif /* _SPARC64_BACKOFF_H */
|