linux-kernel - Re: [PATCH v9 1/6] filemap: check compound_head(page)->mapping in filemap

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Message-ID: <20190710174418.GA11197@cmpxchg.org>
Date:   Wed, 10 Jul 2019 13:44:18 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Song Liu <songliubraving@...com>
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, matthew.wilcox@...cle.com,
        kirill.shutemov@...ux.intel.com, kernel-team@...com,
        william.kucharski@...cle.com, akpm@...ux-foundation.org,
        hdanton@...a.com
Subject: Re: [PATCH v9 1/6] filemap: check compound_head(page)->mapping in
 filemap_fault()

On Mon, Jun 24, 2019 at 05:12:41PM -0700, Song Liu wrote:
> Currently, filemap_fault() avoids trace condition with truncate by

                                   -t

> checking page->mapping == mapping. This does not work for compound
> pages. This patch let it check compound_head(page)->mapping instead.
>
> Acked-by: Rik van Riel <riel@...riel.com>
> Signed-off-by: Song Liu <songliubraving@...com>

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