From: Robert P. J. Day <rpjday@crashcourse.ca>
Date: Wed, 6 Feb 2008 09:36:51 +0000 (-0800)
Subject: rd: use is_power_of_2() in drivers/block/rd.c.
X-Git-Tag: v2.6.25-rc1~737
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67a3b2b6ce09809b21f60401e81663f2c8131640;p=linux-2.6

rd: use is_power_of_2() in drivers/block/rd.c.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/block/rd.c b/drivers/block/rd.c
index 82f4eecc86..06e23be709 100644
--- a/drivers/block/rd.c
+++ b/drivers/block/rd.c
@@ -56,6 +56,7 @@
 #include <linux/backing-dev.h>
 #include <linux/blkpg.h>
 #include <linux/writeback.h>
+#include <linux/log2.h>
 
 #include <asm/uaccess.h>
 
@@ -450,7 +451,7 @@ static int __init rd_init(void)
 	err = -ENOMEM;
 
 	if (rd_blocksize > PAGE_SIZE || rd_blocksize < 512 ||
-			(rd_blocksize & (rd_blocksize-1))) {
+			!is_power_of_2(rd_blocksize)) {
 		printk("RAMDISK: wrong blocksize %d, reverting to defaults\n",
 		       rd_blocksize);
 		rd_blocksize = BLOCK_SIZE;