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authorZhao Yakui <yakui.zhao@intel.com>2008-06-24 17:58:53 +0800
committerAndi Kleen <andi@basil.nowhere.org>2008-07-16 23:27:05 +0200
commitc1e3b377ad48febba6f91b8ae42c44ee4d4ab45e (patch)
tree7893e4226f52c4001150066f544415c1b17741f5 /include
parent5b53496a5ad79e91052f72761a7c5516b069bc99 (diff)
ACPI: Create "idle=halt" bootparam
"idle=halt" limits the idle loop to using the halt instruction. No MWAIT, no IO accesses, no C-states deeper than C1. If something is broken in the idle code, "idle=halt" is a less severe workaround than "idle=poll" which disables all power savings. Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/asm-ia64/processor.h1
-rw-r--r--include/asm-x86/processor.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-ia64/processor.h b/include/asm-ia64/processor.h
index 6aff126fc07..f36e28a5f61 100644
--- a/include/asm-ia64/processor.h
+++ b/include/asm-ia64/processor.h
@@ -763,6 +763,7 @@ prefetchw (const void *x)
#define spin_lock_prefetch(x) prefetchw(x)
extern unsigned long boot_option_idle_override;
+extern unsigned long idle_halt;
#endif /* !__ASSEMBLY__ */
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
index 7f738270459..bc221623248 100644
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -727,6 +727,7 @@ extern int force_mwait;
extern void select_idle_routine(const struct cpuinfo_x86 *c);
extern unsigned long boot_option_idle_override;
+extern unsigned long idle_halt;
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);