linux-kernel - [kj] is_power_of

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Date:	Mon, 13 Aug 2007 18:33:13 +0530
From:	vignesh babu <vignesh.babu@...ro.com>
To:	clameter@....com
Cc:	linux-mm@...ck.org, linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Janitors List <kernel-janitors@...ts.osdl.org>
Subject: [kj] is_power_of_2 in mm/slub.c

Replacing n & (n - 1) for power of 2 check by is_power_of_2(n)

Signed-off-by: vignesh babu <vignesh.babu@...ro.com>
---
diff --git a/mm/slub.c b/mm/slub.c
index 69d02e3..1241d14 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -20,6 +20,7 @@
 #include <linux/mempolicy.h>
 #include <linux/ctype.h>
 #include <linux/kallsyms.h>
+#include <linux/log2.h>
 
 /*
  * Lock order:
@@ -2606,7 +2607,7 @@ void __init kmem_cache_init(void)
 	 * around with ARCH_KMALLOC_MINALIGN
 	 */
 	BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 ||
-		(KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1)));
+		!is_power_of_2(KMALLOC_MIN_SIZE));
 
 	for (i = 8; i < KMALLOC_MIN_SIZE; i += 8)
 		size_index[(i - 1) / 8] = KMALLOC_SHIFT_LOW;

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

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