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

[Johannes Weiner]

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@xxxxxxxxxxxxxxxx
> 
> Cc: Vlastimil Vlastimil Babka <vbabka@xxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Chen Gang <gang.chen.5i5j@xxxxxxxxx>
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>