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Date:   Sun, 27 Aug 2023 20:24:19 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Yin Fengwei <fengwei.yin@intel.com>
Cc:     Yu Zhao <yuzhao@google.com>, Ryan Roberts <ryan.roberts@arm.com>,
        David Hildenbrand <david@redhat.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Matthew Wilcox <willy@infradead.org>,
        Minchan Kim <minchan@kernel.org>,
        Vishal Moola <vishal.moola@gmail.com>,
        Yang Shi <shy828301@gmail.com>, stable@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 6.4.12] madvise:madvise_cold_or_pageout_pte_range():
 don't use mapcount() against large folio for sharing check
Message-ID: <2023082709-universal-zipfile-f50c@gregkh>
References: <20230827135211.2115099-1-fengwei.yin@intel.com>
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On Sun, Aug 27, 2023 at 09:52:11PM +0800, Yin Fengwei wrote:
> Patch series "don't use mapcount() to check large folio sharing", v2.
> 
> In madvise_cold_or_pageout_pte_range() and madvise_free_pte_range(),
> folio_mapcount() is used to check whether the folio is shared.  But it's
> not correct as folio_mapcount() returns total mapcount of large folio.

All backports now queued up, thanks!

greg k-h