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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 /include/asm-ia64 | |
| 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 'include/asm-ia64')
| -rw-r--r-- | include/asm-ia64/processor.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-ia64/processor.h b/include/asm-ia64/processor.h index 6aff126fc07e..f36e28a5f61e 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__ */ |