linux-kernel - [PATCH] fork: use vma_pages() to simplify the code

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Message-Id: <1338403851-4119-1-git-send-email-shijie8@gmail.com>
Date:	Wed, 30 May 2012 14:50:51 -0400
From:	Huang Shijie <shijie8@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Huang Shijie <shijie8@...il.com>
Subject: [PATCH] fork: use vma_pages() to simplify the code

The current code can be replaced by vma_pages().
So use it to simplify the code.

Signed-off-by: Huang Shijie <shijie8@...il.com>
---
 kernel/fork.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 3417e1b..3decf6d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -386,7 +386,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 		charge = 0;
 		if (mpnt->vm_flags & VM_ACCOUNT) {
 			unsigned long len;
-			len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT;
+			len = vma_pages(mpnt);
 			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
 				goto fail_nomem;
 			charge = len;
-- 
1.7.4.4

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