Re: [PATCH 6.4.12] madvise:madvise_cold_or_pageout_pte_range(): don't use mapcount() against large folio for sharing check

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