diff options
| author | Ingo Molnar <mingo@elte.hu> | 2008-07-29 00:07:55 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-29 00:07:55 +0200 |
| commit | cb28a1bbdb4790378e7366d6c9ee1d2340b84f92 (patch) | |
| tree | 316436f77dac75335fd2c3ef5f109e71606c50d3 /arch/sparc/include/asm/backoff.h | |
| parent | b6d4f7e3ef25beb8c658c97867d98883e69dc544 (diff) | |
| parent | f934fb19ef34730263e6afc01e8ec27a8a71470f (diff) | |
Merge branch 'linus' into core/generic-dma-coherent
Conflicts:
arch/x86/Kconfig
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/sparc/include/asm/backoff.h')
| -rw-r--r-- | arch/sparc/include/asm/backoff.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/backoff.h b/arch/sparc/include/asm/backoff.h new file mode 100644 index 00000000000..fa1fdf67e35 --- /dev/null +++ b/arch/sparc/include/asm/backoff.h @@ -0,0 +1,31 @@ +#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; \ + set BACKOFF_LIMIT, tmp; \ + cmp reg, tmp; \ + 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 */ |