mm/rmap: warn on new PTE-mapped folios in page_add_anon_rmap()

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If swapin code would ever decide to not use order-0 pages and supply a
PTE-mapped large folio, we will have to change how we call
__folio_set_anon() -- eventually with exclusive=false and an adjusted
address.  For now, let's add a VM_WARN_ON_FOLIO() with a comment about the
situation.

Link: https://lkml.kernel.org/r/20230913125113.313322-5-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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David Hildenbrand 2023-09-13 14:51:11 +02:00 • committed by Andrew Morton

parent c5c5400347

commit a1f34ee1de

1 changed files with 7 additions and 0 deletions

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mm/rmap.c

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