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authorYanmin Zhang <yanmin_zhang@linux.intel.com>2012-01-11 03:48:21 +0400
committerLen Brown <len.brown@intel.com>2012-01-17 23:19:58 +0400
commit63ff07beaebef2a82da41cf04053ae88b579226d (patch)
treea7a7dfc0c1a2de4d2b45e6762226760f44bbc076
parent39a74fdedd1c1461d6fb6d330b5266886513c98f (diff)
downloadlinux-63ff07beaebef2a82da41cf04053ae88b579226d.tar.xz
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>
-rw-r--r--drivers/idle/intel_idle.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index af0b4a5d52f2..920c61c730a1 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -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.