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intel_idle: remove redundant local_irq_disable() call 

irq disabling happens earlier in process_32.c:cpu_idle.  Basically,
cpuidle_state->enter is called, cpu irq is disabled.  cpuidle_state->enter
would turn on irq when exiting.

intel_idle doesn't follow this assumption.  Although it doesn't cause real
issue, it misleads developers.  Remove the call to local_irq_disable() at
entry.

[akpm@linux-foundation.org: add comment]
Signed-off-by: Mingming Zhang <mingmingx.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Yanmin Zhang 2012-01-10 15:48:21 -08:00 committed by Len Brown
parent 39a74fdedd
commit 63ff07beae
1 changed files with 1 additions and 2 deletions
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3
drivers/idle/intel_idle.c
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@ -232,6 +232,7 @@ static int get_driver_data(int cstate)
* @drv: cpuidle driver
* @index: index of cpuidle state
*
* Must be called under local_irq_disable().
*/
static int intel_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
@ -247,8 +248,6 @@ static int intel_idle(struct cpuidle_device *dev,
cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1;
local_irq_disable();
/*
* leave_mm() to avoid costly and often unnecessary wakeups
* for flushing the user TLB's associated with the active mm.