linux-kernel - Re: [PATCH] mm/sparse: remove a check that compare if unsigned variable is negative

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Date:   Fri, 19 Oct 2018 08:28:01 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Pavel Tatashin <pasha.tatashin@...il.com>
Cc:     penghao122@...a.com.cn,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        pasha.tatashin@...cle.com, osalvador@...e.de,
        LKML <linux-kernel@...r.kernel.org>, peng.hao2@....com.cn
Subject: Re: [PATCH] mm/sparse: remove a check that compare if unsigned
 variable is negative

On Sat, Oct 13, 2018 at 01:04:45PM -0400, Pavel Tatashin wrote:
>This is incorrect: next_present_section_nr() returns "int" and -1 no
>next section, this change would lead to infinite loop.

Yes, the -1 is a very special value.

-- 
Wei Yang
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