Signed-off-by: Robert P. J. Day <rpjday@xxxxxxxxxxxxxx>
---
compile-tested on i386.
diff --git a/drivers/block/rd.c b/drivers/block/rd.c
index 47f8ac6..6b12467 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>
@@ -437,7 +438,7 @@ 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;
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://crashcourse.ca
========================================================================
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