linux-kernel - [PATCH] madvise_need_mmap

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Date:	Fri, 15 Jun 2007 11:20:31 -0400 (EDT)
From:	Jason Baron <jbaron@...hat.com>
To:	linux-kernel@...r.kernel.org
cc:	linux-mm@...ck.org, nickpiggin@...oo.com.au,
	Rik van Riel <riel@...hat.com>
Subject: [PATCH] madvise_need_mmap_write() usage


hi,

i was just looking at the new madvise_need_mmap_write() call...can we
avoid an extra case statement and function call as follows?

thanks,

-Jason


Signed-off-by: Jason Baron <jbaron@...hat.com>

diff --git a/mm/madvise.c b/mm/madvise.c
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -287,9 +287,10 @@ asmlinkage long sys_madvise(unsigned long start, size_t len_in, int behavior)
 	struct vm_area_struct * vma, *prev;
 	int unmapped_error = 0;
 	int error = -EINVAL;
+	int write;
 	size_t len;
 
-	if (madvise_need_mmap_write(behavior))
+	if (write = madvise_need_mmap_write(behavior))
 		down_write(&current->mm->mmap_sem);
 	else
 		down_read(&current->mm->mmap_sem);
@@ -354,7 +355,7 @@ asmlinkage long sys_madvise(unsigned long start, size_t len_in, int behavior)
 			vma = find_vma(current->mm, start);
 	}
 out:
-	if (madvise_need_mmap_write(behavior))
+	if (write)
 		up_write(&current->mm->mmap_sem);
 	else
 		up_read(&current->mm->mmap_sem);
-
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