From: Yanmin Zhang <yanmin_zhang@xxxxxxxxxxxxxxx> Subject: drivers/idle/intel_idle.c: 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@xxxxxxxxxxxxxxxxxxxx: add comment] Signed-off-by: mzha38X <mingmingx.zhang@xxxxxxxxx> Cc: "Li, Shaohua" <shaohua.li@xxxxxxxxx> Cc: "Brown, Len" <len.brown@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/idle/intel_idle.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff -puN drivers/idle/intel_idle.c~drivers-idle-intel_idlec-remove-redundant-local_irq_disable-call drivers/idle/intel_idle.c --- a/drivers/idle/intel_idle.c~drivers-idle-intel_idlec-remove-redundant-local_irq_disable-call +++ a/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_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. _ -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
