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ACPI: Create "idle=halt" bootparam

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"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>
This commit is contained in:
Zhao Yakui 2008-06-24 17:58:53 +08:00 • committed by Andi Kleen
commit c1e3b377ad
6 changed files with 45 additions and 2 deletions
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include/asm-x86/processor.h
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@ -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);