diff options
| author | Len Brown <len.brown@intel.com> | 2013-02-10 01:38:39 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2013-02-10 03:03:41 -0500 |
| commit | 69fb3676df3329a7142803bb3502fa59dc0db2e3 (patch) | |
| tree | e2cfa5a6513e07d01e6b1fe935f09be8300d7bde /drivers/acpi | |
| parent | 6a377ddc4e4ede2eeb9cd46ada23bbe417704fc9 (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But mwait_idle() has been replaced by the more general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 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index ed9a1cc690be..52a5e3a4cdc3 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -84,7 +84,6 @@ static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device); static int disabled_by_idle_boot_param(void) { return boot_option_idle_override == IDLE_POLL || - boot_option_idle_override == IDLE_FORCE_MWAIT || boot_option_idle_override == IDLE_HALT; } |