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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
parent 5b53496a5a
commit c1e3b377ad
6 changed files with 45 additions and 2 deletions
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2
arch/ia64/kernel/process.c
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@ -55,6 +55,8 @@ void (*ia64_mark_idle)(int);
unsigned long boot_option_idle_override = 0;
EXPORT_SYMBOL(boot_option_idle_override);
unsigned long idle_halt;
EXPORT_SYMBOL(idle_halt);
void
ia64_do_show_stack (struct unw_frame_info *info, void *arg)