linux-kernel - [PATCH 1/1] mmap.c: find_vma: eliminate initial if(mm) check

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Message-Id: <1365326292-2761-1-git-send-email-k80ck80c@gmail.com>
Date:	Sun,  7 Apr 2013 14:48:12 +0530
From:	k80c <k80ck80c@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...nel.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	k80c <k80ck80c@...il.com>
Subject: [PATCH 1/1] mmap.c: find_vma: eliminate initial if(mm) check

As per commit 841e31e5cc6219d62054788faa289b6ed682d068,
we dont really need this if(mm) check anymore.

A WARN_ON_ONCE was added just for safety, but there have been no bug
reports about this so far.

Removing this if(mm) check.

Signed-off-by: k80c <k80ck80c@...il.com>
---
 mm/mmap.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 0db0de1..b2c363f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1935,9 +1935,6 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
 {
 	struct vm_area_struct *vma = NULL;
 
-	if (WARN_ON_ONCE(!mm))		/* Remove this in linux-3.6 */
-		return NULL;
-
 	/* Check the cache first. */
 	/* (Cache hit rate is typically around 35%.) */
 	vma = ACCESS_ONCE(mm->mmap_cache);
-- 
1.7.5.4

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