linux-kernel - [PATCH v3 5/9] video/uvc: use memweight()

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Message-Id: <1339203038-13069-5-git-send-email-akinobu.mita@gmail.com>
Date:	Sat,  9 Jun 2012 09:50:34 +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>, linux-media@...r.kernel.org
Subject: [PATCH v3 5/9] video/uvc: use memweight()

Use memweight() to count the total number of bits set in memory area.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: linux-media@...r.kernel.org
---
No changes from v1

 drivers/media/video/uvc/uvc_ctrl.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
index af26bbe..f7061a5 100644
--- a/drivers/media/video/uvc/uvc_ctrl.c
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -2083,7 +2083,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
 	/* Walk the entities list and instantiate controls */
 	list_for_each_entry(entity, &dev->entities, list) {
 		struct uvc_control *ctrl;
-		unsigned int bControlSize = 0, ncontrols = 0;
+		unsigned int bControlSize = 0, ncontrols;
 		__u8 *bmControls = NULL;
 
 		if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
@@ -2101,8 +2101,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
 		uvc_ctrl_prune_entity(dev, entity);
 
 		/* Count supported controls and allocate the controls array */
-		for (i = 0; i < bControlSize; ++i)
-			ncontrols += hweight8(bmControls[i]);
+		ncontrols = memweight(bmControls, bControlSize);
 		if (ncontrols == 0)
 			continue;
 
-- 
1.7.7.6

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