linux-kernel - [PATCH] drm/radeon: Use hweight32

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Date:	Fri,  9 Nov 2012 21:10:41 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/radeon: Use hweight32

Use hweight32 instead of counting for each bit

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: dri-devel@...ts.freedesktop.org
---
 drivers/gpu/drm/radeon/r600.c    | 8 +-------
 drivers/gpu/drm/radeon/r600_cp.c | 7 +------
 2 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index cda280d..169ecc9 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1424,13 +1424,7 @@ u32 r6xx_remap_render_backend(struct radeon_device *rdev,
 
 int r600_count_pipe_bits(uint32_t val)
 {
-	int i, ret = 0;
-
-	for (i = 0; i < 32; i++) {
-		ret += val & 1;
-		val >>= 1;
-	}
-	return ret;
+	return hweight32(val);
 }
 
 static void r600_gpu_init(struct radeon_device *rdev)
diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
index 2514123..be85f75 100644
--- a/drivers/gpu/drm/radeon/r600_cp.c
+++ b/drivers/gpu/drm/radeon/r600_cp.c
@@ -721,12 +721,7 @@ static u32 r600_get_tile_pipe_to_backend_map(u32 num_tile_pipes,
 
 static int r600_count_pipe_bits(uint32_t val)
 {
-	int i, ret = 0;
-	for (i = 0; i < 32; i++) {
-		ret += val & 1;
-		val >>= 1;
-	}
-	return ret;
+	return hweight32(val);
 }
 
 static void r600_gfx_init(struct drm_device *dev,
-- 
1.7.11.7

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