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Add one comment for the pfn_valid() check. > > We have to introduce VM_WARN_ON_ONCE_VMA() to make that fly. > > Drop the BUG_ON after mmap_read_lock_killable(), if that ever returns > something > 0 we're in bigger trouble. Convert the other BUG_ON's into > VM_WARN_ON_ONCE as well, they are in a similar domain "should never > happen", but more reasonable to check for during early testing. > > Cc: Andrew Morton > Cc: Lorenzo Stoakes > Cc: "Liam R. Howlett" > Cc: Vlastimil Babka > Cc: Mike Rapoport > Cc: Suren Baghdasaryan > Cc: Michal Hocko > Cc: Jason Gunthorpe > Cc: John Hubbard > Cc: Peter Xu > Signed-off-by: David Hildenbrand > --- > > Wanted to do this for a long time, but my todo list keeps growing ... > > Based on mm/mm-unstable Thanks everybody for the review -- that must be one of my patches with most RB's/ACK's/feedback :) The following fixup on top to use the _FOLIO variant where possible (thanks Lorenzo). From c3b2567f169f10f96b94d61369d8492e3095f187 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Fri, 6 Jun 2025 10:08:20 +0200 Subject: [PATCH] fixup Signed-off-by: David Hildenbrand --- mm/gup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index 3c3931fcdd820..25fd0d895e453 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -64,7 +64,7 @@ static inline void sanity_check_pinned_pages(struct page **pages, !folio_test_anon(folio)) continue; if (!folio_test_large(folio) || folio_test_hugetlb(folio)) - VM_WARN_ON_ONCE_PAGE(!PageAnonExclusive(&folio->page), page); + VM_WARN_ON_ONCE_FOLIO(!PageAnonExclusive(&folio->page), folio); else /* Either a PTE-mapped or a PMD-mapped THP. */ VM_WARN_ON_ONCE_PAGE(!PageAnonExclusive(&folio->page) && -- 2.49.0 -- Cheers, David / dhildenb