linux-kernel - Re: [PATCH] mm: vmscan: fix get_swappiness() return value type

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Message-ID: <ZPlWmbu+pLIPgyYC@casper.infradead.org>
Date:   Thu, 7 Sep 2023 05:50:33 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Zhiguo Jiang <justinjiang@...o.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, opensource.kernel@...o.com
Subject: Re: [PATCH] mm: vmscan: fix get_swappiness() return value type

On Thu, Sep 07, 2023 at 12:40:45PM +0800, Zhiguo Jiang wrote:
> Fix bool to int of the get_swappiness() return value type in
> lruvec_is_sizable().
> 
> The get_swappiness() return value type is int, but the
> get_swappiness() return value type is bool in lruvec_is_sizable().
> So there is a possibility of value overflow.

Have you looked at how the C spec defines int->bool conversion?