From: Shivank Garg <shivankg@amd.com>
To: Luiz Capitulino <luizcap@redhat.com>,
david@redhat.com, willy@infradead.org
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, lcapitulino@gmail.com
Subject: Re: [PATCH 2/3] proc: kpagecount: use snapshot_page()
Date: Wed, 2 Jul 2025 11:55:05 +0530 [thread overview]
Message-ID: <3ee3adfc-5efc-43dd-9c75-23564fade7b3@amd.com> (raw)
In-Reply-To: <5e94d287b6174098938ddd9959cf3c0619fb610a.1750961812.git.luizcap@redhat.com>
On 6/26/2025 11:46 PM, Luiz Capitulino wrote:
> Currently, the call to folio_precise_page_mapcount() from kpage_read()
> can race with a folio split. When the race happens we trigger a
> VM_BUG_ON_FOLIO() in folio_entire_mapcount() (see splat below).
>
> This commit fixes this race by using snapshot_page() so that we
> retreive the folio mapcount using a folio snapshot.
s/retreive/retrieve/
checkpatch.pl would have flagged this.
Rest looks good to me.
Thanks,
Shivank
next prev parent reply other threads:[~2025-07-02 6:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-26 18:16 [PATCH 0/3] mm: introduce snapshot_page() Luiz Capitulino
2025-06-26 18:16 ` [PATCH 1/3] " Luiz Capitulino
2025-06-26 21:39 ` Andrew Morton
2025-06-26 21:42 ` Luiz Capitulino
2025-06-26 18:16 ` [PATCH 2/3] proc: kpagecount: use snapshot_page() Luiz Capitulino
2025-06-27 18:30 ` SeongJae Park
2025-07-01 18:36 ` David Hildenbrand
2025-07-02 6:25 ` Shivank Garg [this message]
2025-07-02 17:38 ` Luiz Capitulino
2025-06-26 18:16 ` [PATCH 3/3] fs: stable_page_flags(): " Luiz Capitulino
2025-07-01 18:44 ` David Hildenbrand
2025-07-02 17:36 ` Luiz Capitulino
2025-07-02 6:40 ` [PATCH 0/3] mm: introduce snapshot_page() Shivank Garg
2025-07-02 17:39 ` Luiz Capitulino
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