linux-kernel - Re: [PATCH 1/1] mm: mmap: Remove unnecessary local variable

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Date:   Tue, 29 Dec 2020 10:17:46 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Adrian Huang <adrianhuang0701@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Adrian Huang <ahuang12@...ovo.com>
Subject: Re: [PATCH 1/1] mm: mmap: Remove unnecessary local variable

On 22.12.20 11:32, Adrian Huang wrote:
> From: Adrian Huang <ahuang12@...ovo.com>
> 
> The local variable 'retval' is assigned just for once in __do_sys_brk(),
> and the function returns the value of the local variable right after
> the assignment. Remove unnecessary assignment and local variable
> declaration.
> 
> Signed-off-by: Adrian Huang <ahuang12@...ovo.com>
> ---
>  mm/mmap.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/mm/mmap.c b/mm/mmap.c
> index dc7206032387..482c0c0bbe06 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -189,7 +189,6 @@ static int do_brk_flags(unsigned long addr, unsigned long request, unsigned long
>  		struct list_head *uf);
>  SYSCALL_DEFINE1(brk, unsigned long, brk)
>  {
> -	unsigned long retval;
>  	unsigned long newbrk, oldbrk, origbrk;
>  	struct mm_struct *mm = current->mm;
>  	struct vm_area_struct *next;
> @@ -281,9 +280,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
>  	return brk;
>  
>  out:
> -	retval = origbrk;
>  	mmap_write_unlock(mm);
> -	return retval;
> +	return origbrk;
>  }

Reviewed-by: David Hildenbrand <david@...hat.com>


-- 
Thanks,

David / dhildenb