[PATCH 0/2] don't use mapcount() to check large folio sharing

Yin Fengwei
2023-07-28T16:15:38Z

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.

Use folio_estimated_sharers() here as the estimated number is enough.

Yin Fengwei (2):
madvise: don't use mapcount() against large folio for sharing check
madvise: don't use mapcount() against large folio for sharing check

mm/huge_memory.c | 2 +-
mm/madvise.c | 6 +++---
2 files changed, 4 insertions(+), 4 deletions(-)

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2.39.2