| commit | 5d4c47e0195b989f284907358bd5c268a44b91c7 | |
| author | Len Brown <len.brown@intel.com> | |
| Fri, 1 Apr 2011 19:46:09 +0000 (1 15:46 -0400) | ||
| committer | Len Brown <len.brown@intel.com> | |
| Sun, 29 May 2011 07:39:17 +0000 (29 03:39 -0400) | ||
| tree | 3a7c81ff3b3f5a5eb6199044a72c0145b58db413 | treesnapshot (tar.gz zip) |
| parent | cdaab4a0d330f70c0e5ad8c3f7c65c2e375ea180 | commitdiff |
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But mwait_idle() has been replaced by the more general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>
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But mwait_idle() has been replaced by the more general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>
| Documentation/feature-removal-schedule.txt | diffblobblamehistory | |
| arch/x86/kernel/process.c | diffblobblamehistory |