diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-28 08:33:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-28 08:33:25 -0700 |
| commit | c32f1a34ff1097110469a240ea4539dc9c101e96 (patch) | |
| tree | eda863205e83afe54cbedcf15cdac416cdec2cf5 /arch/sparc/include/asm/backoff.h | |
| parent | 4f31f3080943c7e3541f07df326f06d598a067d0 (diff) | |
| parent | 04d91cb8163f7f946e348b2362a6e5dfa5f06b13 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
sparc: Set CONFIG_HAVE_ARCH_TRACEHOOK
sparc: Add task_pt_regs().
sparc: Add call to tracehook_signal_handler().
sparc: Create and use TIF_NOTIFY_RESUME.
sparc: Use tracehook routines in syscall_trace().
sparc64: tracehook: CONFIG_HAVE_ARCH_TRACEHOOK
sparc: Add user_stack_pointer().
sparc64: tracehook_signal_handler
sparc64: tracehook: TIF_NOTIFY_RESUME
sparc: Add asm/syscall.h
sparc64: tracehook syscall
sparc: enable headers_export again
sparc, sparc64: use arch/sparc/include
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 */ |