tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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 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)
24#define BACKOFF_SPIN(reg, tmp, label) \
25 ba,pt %xcc, label; \
26 nop;
27
28#endif
29
30#endif /* _SPARC64_BACKOFF_H */