From: Huang Shijie <shijie8@gmail.com>
Date: Mon, 30 Jul 2012 21:42:30 +0000 (-0700)
Subject: fork: use vma_pages() to simplify the code
X-Git-Tag: firefly_0821_release~3680^2~2297^2~23
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b2412b7fa7a3816fa8633dc2ff19f1a90aabe423;p=firefly-linux-kernel-4.4.55.git

fork: use vma_pages() to simplify the code

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

[akpm@linux-foundation.org: initialise `len' at its definition site]
Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/fork.c b/kernel/fork.c
index ff1cad3b7bdc..2c1802948a38 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -391,8 +391,8 @@ 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;
+			unsigned long len = vma_pages(mpnt);
+
 			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
 				goto fail_nomem;
 			charge = len;