From 67a3b2b6ce09809b21f60401e81663f2c8131640 Mon Sep 17 00:00:00 2001
From: "Robert P. J. Day" <rpjday@crashcourse.ca>
Date: Wed, 6 Feb 2008 01:36:51 -0800
Subject: [PATCH] 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>
---
drivers/block/rd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/block/rd.c b/drivers/block/rd.c
index 82f4eecc8699..06e23be70904 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;