linux-kernel - [KJ][PATCH]is_power_of

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Message-Id: <1181210266.11218.3.camel@merlin.linuxcoe.com>
Date:	Thu, 07 Jun 2007 15:27:46 +0530
From:	vignesh babu <vignesh.babu@...ro.com>
To:	tony.luck@...el.com, rohit.seth@...el.com, kenneth.w.chen@...el.com
Cc:	linux-ia64@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Janitors List <kernel-janitors@...ts.osdl.org>
Subject: [KJ][PATCH]is_power_of_2-ia64/mm/hugetlbpage.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/arch/ia64/mm/hugetlbpage.c b/arch/ia64/mm/hugetlbpage.c
index 1346b7f..d22861c 100644
--- a/arch/ia64/mm/hugetlbpage.c
+++ b/arch/ia64/mm/hugetlbpage.c
@@ -15,6 +15,7 @@
 #include <linux/pagemap.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
+#include <linux/log2.h>
 #include <asm/mman.h>
 #include <asm/pgalloc.h>
 #include <asm/tlb.h>
@@ -182,7 +183,7 @@ static int __init hugetlb_setup_sz(char *str)
 		tr_pages = 0x15557000UL;
 
 	size = memparse(str, &str);
-	if (*str || (size & (size-1)) || !(tr_pages & size) ||
+	if (*str || !is_power_of_2(size) || !(tr_pages & size) ||
 		size <= PAGE_SIZE ||
 		size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
 		printk(KERN_WARNING "Invalid huge page size specified\n");

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

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