linux-kernel - Re: [PATCH 1/1] Trivial: Eliminate the ret variable from mm_take_all

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Message-ID: <CAFPAmTQPLPnB8EhZYvcdWFPtmWC+my0M3qoojBsms=0SwQ9XXA@mail.gmail.com>
Date:	Wed, 21 Sep 2011 09:09:47 +0530
From:	"kautuk.c @samsung.com" <consul.kautuk@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Shaohua Li <shaohua.li@...el.com>,
	Jiri Kosina <trivial@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Trivial: Eliminate the ret variable from mm_take_all_locks

Thanks, Michal.

On Tue, Sep 20, 2011 at 12:44 PM, Michal Hocko <mhocko@...e.cz> wrote:
> On Tue 13-09-11 15:55:31, Kautuk Consul wrote:
>> The ret variable is really not needed in mm_take_all_locks as per
>> the current flow of the mm_take_all_locks function.
>>
>> So, eliminating this return variable.
>>
>> Signed-off-by: Kautuk Consul <consul.kautuk@...il.com>
>
> The compiled code seems to be very same - compilers are clever enough to
> reorganize the code but anyway the code reads better this way.
>
> Reviewed-by: Michal Hocko <mhocko@...e.cz>
>
>> ---
>>  mm/mmap.c |    8 +++-----
>>  1 files changed, 3 insertions(+), 5 deletions(-)
>>
>> diff --git a/mm/mmap.c b/mm/mmap.c
>> index a65efd4..48bc056 100644
>> --- a/mm/mmap.c
>> +++ b/mm/mmap.c
>> @@ -2558,7 +2558,6 @@ int mm_take_all_locks(struct mm_struct *mm)
>>  {
>>       struct vm_area_struct *vma;
>>       struct anon_vma_chain *avc;
>> -     int ret = -EINTR;
>>
>>       BUG_ON(down_read_trylock(&mm->mmap_sem));
>>
>> @@ -2579,13 +2578,12 @@ int mm_take_all_locks(struct mm_struct *mm)
>>                               vm_lock_anon_vma(mm, avc->anon_vma);
>>       }
>>
>> -     ret = 0;
>> +     return 0;
>>
>>  out_unlock:
>> -     if (ret)
>> -             mm_drop_all_locks(mm);
>> +     mm_drop_all_locks(mm);
>>
>> -     return ret;
>> +     return -EINTR;
>>  }
>>
>>  static void vm_unlock_anon_vma(struct anon_vma *anon_vma)
>> --
>> 1.7.6
>>
>> --
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>
> --
> Michal Hocko
> SUSE Labs
> SUSE LINUX s.r.o.
> Lihovarska 1060/12
> 190 00 Praha 9
> Czech Republic
>
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