From: Jean Delvare <khali@xxxxxxxxxxxx>
Subject: drm/i915: Optimize DIV_ROUND_CLOSEST call
DIV_ROUND_CLOSEST is faster if the compiler knows it will only be
dealing with unsigned dividends.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
---
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-3.6-rc3.orig/drivers/gpu/drm/i915/intel_pm.c 2012-08-28 14:46:22.000000000 +0200
+++ linux-3.6-rc3/drivers/gpu/drm/i915/intel_pm.c 2012-09-01 21:17:32.074619227 +0200
@@ -2499,7 +2499,8 @@ 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
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