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| author |   Zhao Yakui <yakui.zhao@intel.com> | 2008-06-24 17:58:53 +0800 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2008-07-16 23:27:05 +0200 |
| commit | c1e3b377ad48febba6f91b8ae42c44ee4d4ab45e (patch) | |
| tree | 7893e4226f52c4001150066f544415c1b17741f5 /arch/ia64/kernel/process.c | |
| parent | ACPI: Disable the C2C3_FFH access mode HW has no MWAIT support (diff) | |
| download | linux-dev-c1e3b377ad48febba6f91b8ae42c44ee4d4ab45e.tar.xz linux-dev-c1e3b377ad48febba6f91b8ae42c44ee4d4ab45e.zip | |
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 'arch/ia64/kernel/process.c')
| -rw-r--r-- | arch/ia64/kernel/process.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index fabaf08d9a69..612b3c4a0603 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -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) |