linux-kernel - Re: [PATCH] mm/mmap.c: Remove useless statement "vma = NULL" in find

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Message-ID: <55E7C654.2080309@21cn.com>
Date:	Thu, 03 Sep 2015 12:02:28 +0800
From:	Chen Gang <gchen_5i5j@...n.com>
To:	gang.chen.5i5j@...il.com, akpm@...ux-foundation.org, mhocko@...e.cz
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/mmap.c: Remove useless statement "vma = NULL" in find_vma()

Hello all:

I also want to consult: the comments of find_vma() says:

  "Look up the first VMA which satisfies  addr < vm_end, ..."

Is it OK? (why not "vm_start <= addr < vm_end"), need we let "vma = tmp"
in "if (tmp->vm_start <= addr)"? -- it looks the comments is not match
the implementation, precisely (maybe not 1st VMA).


Thanks.


On 9/3/15 11:52, gang.chen.5i5j@...il.com wrote:
> From: Chen Gang <gang.chen.5i5j@...il.com>
> 
> Before the main looping, vma is already is NULL, so need not set it to
> NULL, again.
> 
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> ---
>  mm/mmap.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/mm/mmap.c b/mm/mmap.c
> index df6d5f0..4db7cf0 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2054,7 +2054,6 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
>  		return vma;
>  
>  	rb_node = mm->mm_rb.rb_node;
> -	vma = NULL;
>  
>  	while (rb_node) {
>  		struct vm_area_struct *tmp;
> 

-- 
Chen Gang (陈刚)

Open, share, and attitude like air, water, and life which God blessed
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