linux-kernel - [PATCH]is_power_of

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Date:	Thu, 14 Jun 2007 16:05:06 +0530
From:	vignesh babu <vignesh.babu@...ro.com>
To:	stelian <stelian@...ies.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Janitors List <kernel-janitors@...ts.osdl.org>
Subject: [PATCH]is_power_of_2-kernel/kfifo.c


Replacing (n & (n-1)) in the context of power of 2 checks
with is_power_of_2

Signed-off-by: vignesh babu <vignesh.babu@...ro.com>
--- 
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index cee4191..bc41ad0 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/kfifo.h>
+#include <linux/log2.h>
 
 /**
  * kfifo_init - allocates a new FIFO using a preallocated buffer
@@ -41,7 +42,7 @@ struct kfifo *kfifo_init(unsigned char *buffer, unsigned int size,
 	struct kfifo *fifo;
 
 	/* size must be a power of 2 */
-	BUG_ON(size & (size - 1));
+	BUG_ON(!is_power_of_2(size));
 
 	fifo = kmalloc(sizeof(struct kfifo), gfp_mask);
 	if (!fifo)

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

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