linux-kernel - Re: [PATCH] userfaultfd/selftests: use swap() instead of open coding it

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Message-ID: <Yk7kJsk6Y+ASF7ZA@FVFYT0MHHV2J.usts.net>
Date:   Thu, 7 Apr 2022 21:17:38 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Guo Zhengkui <guozhengkui@...o.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        zhengkui_guo@...look.com
Subject: Re: [PATCH] userfaultfd/selftests: use swap() instead of open coding
 it

On Thu, Apr 07, 2022 at 08:31:41PM +0800, Guo Zhengkui wrote:
> Address the following coccicheck warning:
> 
> tools/testing/selftests/vm/userfaultfd.c:1536:21-22: WARNING opportunity
> for swap().
> tools/testing/selftests/vm/userfaultfd.c:1540:33-34: WARNING opportunity
> for swap().
> 
> by using swap() for the swapping of variable values and drop
> `tmp_area` that is not needed any more.
> 
> `swap()` macro in userfaultfd.c is introduced in commit 681696862bc18
> ("selftests: vm: remove dependecy from internal kernel macros")
> 
> It has been tested with gcc (Debian 8.3.0-6) 8.3.0.
> 
> Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>

Thanks.