[PATCH] drm/i915: Optimize DIV_ROUND_CLOSEST call

[Jean Delvare]

DIV_ROUND_CLOSEST is faster if the compiler knows it will only be
dealing with unsigned dividends. This optimization rips 32 bytes of
binary code on x86_64.

Signed-off-by: Jean Delvare <khali at linux-fr.org>
Cc: Guenter Roeck <linux at roeck-us.net>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: David Airlie <airlied at linux.ie>
---
Already sent on: 2012-09-03.

Daniel, I think we can safely assume ia_freq can't be negative?

 drivers/gpu/drm/i915/intel_pm.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-3.7-rc5.orig/drivers/gpu/drm/i915/intel_pm.c	2012-11-12 09:30:56.796836818 +0100
+++ linux-3.7-rc5/drivers/gpu/drm/i915/intel_pm.c	2012-11-12 10:49:38.241676096 +0100
@@ -2547,7 +2547,8 @@ static void gen6_update_ring_freq(struct
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int min_freq = 15;
-	int gpu_freq, ia_freq, max_ia_freq;
+	int gpu_freq;
+	unsigned int ia_freq, max_ia_freq;
 	int scaling_factor = 180;
 
 	WARN_ON(!mutex_is_locked(&dev->struct_mutex));


-- 
Jean Delvare