linux-kernel - Re: [PATCH] mm: fix a data race in put

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Message-Id: <B1A2958B-5FB4-458B-8BE7-73047790CE0B@lca.pw>
Date:   Thu, 6 Feb 2020 18:55:57 -0500
From:   Qian Cai <cai@....pw>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Jan Kara <jack@...e.cz>, David Hildenbrand <david@...hat.com>,
        akpm@...ux-foundation.org, ira.weiny@...el.com,
        dan.j.williams@...el.com, elver@...gle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: fix a data race in put_page()



> On Feb 6, 2020, at 6:34 PM, John Hubbard <jhubbard@...dia.com> wrote:
> 
> * data_race(): there is no race on the N bits worth of page zone number data. There
>  is only a perceived race, due to tools that look at word-level granularity.

I’d like to think this from the compiler level. There is a data race from the compiler load and store point of view. It is just in the case it is harmless to affect the actual code logic.