linux-kernel - [PATCH] mm, vmalloc: Use clamp to simplify code

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Message-ID: <51ACB8B6.60603@gmail.com>
Date:	Mon, 03 Jun 2013 23:39:34 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: [PATCH] mm, vmalloc: Use clamp to simplify code

From: Zhang Yanfei <zhangyanfei@...fujitsu.com>

Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 mm/vmalloc.c |   12 ++----------
 1 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d365724..2d7eb81 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1337,16 +1337,8 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
 	struct vm_struct *area;
 
 	BUG_ON(in_interrupt());
-	if (flags & VM_IOREMAP) {
-		int bit = fls(size);
-
-		if (bit > IOREMAP_MAX_ORDER)
-			bit = IOREMAP_MAX_ORDER;
-		else if (bit < PAGE_SHIFT)
-			bit = PAGE_SHIFT;
-
-		align = 1ul << bit;
-	}
+	if (flags & VM_IOREMAP)
+		align = 1ul << clamp(fls(size), PAGE_SHIFT, IOREMAP_MAX_ORDER);
 
 	size = PAGE_ALIGN(size);
 	if (unlikely(!size))
-- 
1.7.1
--
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