linux-kernel - Re: [PATCH 1/1] mmap.c: find_vma: remove unnecessary if(mm) check

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Date:	Mon, 23 Apr 2012 14:39:48 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rajman Mekaco <rajman.mekaco@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>, Al Viro <viro@...iv.linux.org.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Kautuk Consul <consul.kautuk@...il.com>
Subject: Re: [PATCH 1/1] mmap.c: find_vma: remove unnecessary if(mm) check

On Sat, 21 Apr 2012 19:12:35 +0530
Rajman Mekaco <rajman.mekaco@...il.com> wrote:

> The if(mm) check is not required in find_vma, as the kernel
> code calls find_vma only when it is absolutely sure that the
> mm_struct arg to it is non-NULL.
> 
> Removing the if(mm) check and adding the a WARN_ONCE(!mm)
> for now.

Lets do this as well:

--- a/mm/mmap.c~mm-mmapc-find_vma-remove-unnecessary-ifmm-check-fix
+++ a/mm/mmap.c
@@ -1639,7 +1639,7 @@ struct vm_area_struct *find_vma(struct m
 {
 	struct vm_area_struct *vma = NULL;
 
-	if (WARN_ON_ONCE(!mm))
+	if (WARN_ON_ONCE(!mm))		/* Remove this in linux-3.6 */
 		return NULL;
 
 	/* Check the cache first. */

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