linux-kernel - Re: [PATCH] fix page_count in ->iomap_migrate

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Date:   Fri, 14 Dec 2018 21:55:01 +0800
From:   Gao Xiang <hsiangkao@....com>
To:     Richard Weinberger <richard@....at>
Cc:     Artem Bityutskiy <dedekind1@...il.com>,
        zhangjun <openzhangj@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>, hch@....de,
        bfoster@...hat.com, Dave Chinner <david@...morbit.com>,
        akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
        mhocko@...e.com, n-horiguchi@...jp.nec.com,
        mgorman@...hsingularity.net, aarcange@...hat.com,
        willy@...radead.org, linux@...inikbrodowski.net,
        linux-mm@...ck.org, Gao Xiang <gaoxiang25@...wei.com>
Subject: Re: [PATCH] fix page_count in ->iomap_migrate_page()

Hi Richard,

On 2018/12/14 21:35, Richard Weinberger wrote:
> Hmm, in case of UBIFS it seems easy. We can add a get/put_page() around setting/clearing
> the flag.
> I did that now and so far none of my tests exploded.

Yes, many existed codes are based on this restriction in order to be freeable race-free.
and that's it since PG_Private was once introduced at first by Andrew Morton in 2002
for many Linux versions....and it's not bad I think... :)

Thanks,
Gao Xiang