linux-kernel - Re: [PATCH] mm: Do not use double negation for testing page flags

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Date:   Tue, 7 Mar 2017 12:39:34 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Vlastimil Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Chen Gang <gang.chen.5i5j@...il.com>
Subject: Re: [PATCH] mm: Do not use double negation for testing page flags

On Tue, Mar 07, 2017 at 03:36:37PM +0900, Minchan Kim wrote:
> With the discussion[1], I found it seems there are every PageFlags
> functions return bool at this moment so we don't need double
> negation any more.
> Although it's not a problem to keep it, it makes future users
> confused to use dobule negation for them, too.
> 
> Remove such possibility.
> 
> [1] https://marc.info/?l=linux-kernel&m=148881578820434
> 
> Frankly sepaking, I like every PageFlags return bool instead of int.
> It will make it clear. AFAIR, Chen Gang had tried it but don't know
> why it was not merged at that time.
> 
> http://lkml.kernel.org/r/1469336184-1904-1-git-send-email-chengang@emindsoft.com.cn
> 
> Cc: Vlastimil Vlastimil Babka <vbabka@...e.cz>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Chen Gang <gang.chen.5i5j@...il.com>
> Signed-off-by: Minchan Kim <minchan@...nel.org>

Acked-by: Johannes Weiner <hannes@...xchg.org>