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

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Message-ID: <CANN689GH8eYz+ELX-EyD5pJOUUu_+F0Oxje50P_qpsz2CcTZPQ@mail.gmail.com>
Date:	Sun, 7 Apr 2013 03:13:57 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	k80c <k80ck80c@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mmap.c: find_vma: eliminate initial if(mm) check

On Sun, Apr 7, 2013 at 2:18 AM, k80c <k80ck80c@...il.com> wrote:
> 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);

Looks good to me.

Reviewed-by: Michel Lespinasse <walken@...gle.com>

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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