Commit 5d4c47e0 authored Apr 01, 2011 by Len Brown

x86 idle: deprecate mwait_idle() and "idle=mwait" cmdline param



mwait_idle() is a C1-only idle loop intended to be more efficient
than HLT on SMP hardware that supports it.

But mwait_idle() has been replaced by the more general
mwait_idle_with_hints(), which handles both C1 and deeper C-states.
ACPI uses only mwait_idle_with_hints(), and never uses mwait_idle().

Deprecate mwait_idle() and the "idle=mwait" cmdline param
to simplify the x86 idle code.

After this change, kernels configured with
(!CONFIG_ACPI=n && !CONFIG_INTEL_IDLE=n) when run on hardware
that support MWAIT will simply use HLT.  If MWAIT is desired
on those systems, cpuidle and the cpuidle drivers above
can be used.

cc: x86@kernel.org
cc: stable@kernel.org # .39.x
Signed-off-by: Len Brown <len.brown@intel.com>

parent cdaab4a0

Documentation/feature-removal-schedule.txt

+7 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,13 @@ Who: Len Brown <len.brown@intel.com>

		----------------------------

		What: x86 "idle=mwait" cmdline param
		When: 2012
		Why: simplify x86 idle code
		Who: Len Brown <len.brown@intel.com>

		----------------------------

		What: PRISM54
		When: 2.6.34

arch/x86/kernel/process.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -645,6 +645,7 @@ static int __init idle_setup(char *str)
		boot_option_idle_override = IDLE_POLL;
		} else if (!strcmp(str, "mwait")) {
		boot_option_idle_override = IDLE_FORCE_MWAIT;
		WARN_ONCE(1, "\idle=mwait\" will be removed in 2012\"\n");
		} else if (!strcmp(str, "halt")) {
		/*
		* When the boot option of idle=halt is added, halt is