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List:       linux-s390
Subject:    [PATCH]is_power_of_2-s390/block/dasd_int.h
From:       vignesh babu <vignesh.babu () wipro ! com>
Date:       2007-06-12 5:36:32
Message-ID: 1181625872.11780.23.camel () merlin ! linuxcoe ! com
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Replacing (n & (n-1)) in the context of power of 2 checks
with is_power_of_2

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
--- 
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 241294c..5c28cb4 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -53,6 +53,7 @@
 #include <linux/genhd.h>
 #include <linux/hdreg.h>
 #include <linux/interrupt.h>
+#include <linux/log2.h>
 #include <asm/ccwdev.h>
 #include <linux/workqueue.h>
 #include <asm/debug.h>
@@ -456,7 +457,7 @@ dasd_free_chunk(struct list_head *chunk_list, void *mem)
 static inline int
 dasd_check_blocksize(int bsize)
 {
-	if (bsize < 512 || bsize > 4096 || (bsize & (bsize - 1)) != 0)
+	if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 		return -EMEDIUMTYPE;
 	return 0;
 }

-- 
Vignesh Babu BM 
_____________________________________________________________ 
"Why is it that every time I'm with you, makes me believe in magic?"

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