linux-kernel - [PATCH] xen-blkfront: use bitmap_set() and bitmap

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Date:	Sat, 21 Jan 2012 00:15:26 +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>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH] xen-blkfront: use bitmap_set() and bitmap_clear()

Use bitmap_set and bitmap_clear rather than modifying individual bits
in a memory region.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: xen-devel@...ts.xensource.com
Cc: virtualization@...ts.linux-foundation.org
---
 drivers/block/xen-blkfront.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 2f22874..619868d 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -43,6 +43,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/scatterlist.h>
+#include <linux/bitmap.h>
 
 #include <xen/xen.h>
 #include <xen/xenbus.h>
@@ -177,8 +178,7 @@ static int xlbd_reserve_minors(unsigned int minor, unsigned int nr)
 
 	spin_lock(&minor_lock);
 	if (find_next_bit(minors, end, minor) >= end) {
-		for (; minor < end; ++minor)
-			__set_bit(minor, minors);
+		bitmap_set(minors, minor, nr);
 		rc = 0;
 	} else
 		rc = -EBUSY;
@@ -193,8 +193,7 @@ static void xlbd_release_minors(unsigned int minor, unsigned int nr)
 
 	BUG_ON(end > nr_minors);
 	spin_lock(&minor_lock);
-	for (; minor < end; ++minor)
-		__clear_bit(minor, minors);
+	bitmap_clear(minors,  minor, nr);
 	spin_unlock(&minor_lock);
 }
 
-- 
1.7.4.4

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