intel_idle: simplify test for leave_mm()

A run-time test to invoke leave_mm() for the deepest
supported C-state is redundant, since the appropriate
C-states already have flags with CPUIDLE_FLAG_TLB_FLUSHED set.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index c37ef64d1465..ad0fb0182b4c 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -186,13 +186,10 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
         local_irq_disable();
 
         /*
-         * If the state flag indicates that the TLB will be flushed or if this
-         * is the deepest c-state supported, do a voluntary leave mm to avoid
-         * costly and mostly unnecessary wakeups for flushing the user TLB's
-         * associated with the active mm.
+         * leave_mm() to avoid costly and often unnecessary wakeups
+         * for flushing the user TLB's associated with the active mm.
          */
-        if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED ||
-            (&dev->states[dev->state_count - 1] == state))
+        if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED)
                 leave_mm(cpu);
 
         if (!(lapic_timer_reliable_states & (1 << (cstate))))