Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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; \
1388: brnz,pt tmp, 88b; \
14 sub tmp, 1, tmp; \
15 set BACKOFF_LIMIT, tmp; \
16 cmp reg, tmp; \
17 bg,pn %xcc, label; \
18 nop; \
19 ba,pt %xcc, label; \
20 sllx reg, 1, reg;
21
22#else
23
24#define BACKOFF_SETUP(reg)
25#define BACKOFF_SPIN(reg, tmp, label) \
26 ba,pt %xcc, label; \
27 nop;
28
29#endif
30
31#endif /* _SPARC64_BACKOFF_H */