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authorLen Brown <len.brown@intel.com>2013-02-10 01:38:39 -0500
committerLen Brown <len.brown@intel.com>2013-02-10 03:03:41 -0500
commit69fb3676df3329a7142803bb3502fa59dc0db2e3 (patch)
treee2cfa5a6513e07d01e6b1fe935f09be8300d7bde /arch/x86/include
parent6a377ddc4e4ede2eeb9cd46ada23bbe417704fc9 (diff)
x86 idle: remove mwait_idle() and "idle=mwait" cmdline param
mwait_idle() is a C1-only idle loop intended to be more efficient than HLT, starting on Pentium-4 HT-enabled processors. But mwait_idle() has been replaced by the more general mwait_idle_with_hints(), which handles both C1 and deeper C-states. ACPI processor_idle and intel_idle use only mwait_idle_with_hints(), and no longer use mwait_idle(). Here we simplify the x86 native idle code by removing mwait_idle(), and the "idle=mwait" bootparam used to invoke it. Since Linux 3.0 there has been a boot-time warning when "idle=mwait" was invoked saying it would be removed in 2012. This removal was also noted in the (now removed:-) feature-removal-schedule.txt. After this change, kernels configured with (CONFIG_ACPI=n && CONFIG_INTEL_IDLE=n) when run on hardware that supports MWAIT will simply use HLT. If MWAIT is desired on those systems, cpuidle and the cpuidle drivers above can be enabled. Signed-off-by: Len Brown <len.brown@intel.com> Cc: x86@kernel.org
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/processor.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index c2f7f472275..8a28feae1c9 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -725,7 +725,7 @@ extern unsigned long boot_option_idle_override;
extern bool amd_e400_c1e_detected;
enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
- IDLE_POLL, IDLE_FORCE_MWAIT};
+ IDLE_POLL};
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);