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

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Date:   Tue, 22 Dec 2020 20:47:56 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Adrian Huang <adrianhuang0701@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <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 Tue, Dec 22, 2020 at 4:03 PM Adrian Huang <adrianhuang0701@...il.com> 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>

Acked-by: Souptick Joarder <jrdr.linux@...il.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;
>  }
>
>  static inline unsigned long vma_compute_gap(struct vm_area_struct *vma)
> --
> 2.17.1
>
>