Thread (8 messages) 8 messages, 3 authors, 2012-01-21

Re: [PATCH] xen-blkfront: use bitmap_set() and bitmap_clear()

From: Akinobu Mita <akinobu.mita@gmail.com>
Date: 2012-01-20 15:27:09
Also in: lkml, xen-devel

I used Jeremy Fitzhardinge's old email address...

2012/1/21 Akinobu Mita [off-list ref]:
Use bitmap_set and bitmap_clear rather than modifying individual bits
in a memory region.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jeremy Fitzhardinge <redacted>
Cc: Jeremy Fitzhardinge <redacted>
quoted hunk ↗ jump to hunk
Cc: Konrad Rzeszutek Wilk <redacted>
Cc: xen-devel@lists.xensource.com
Cc: virtualization@lists.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
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help