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mm/rmap: sanity check that zeropages are not passed to RMAP

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Using insert_page() we might have previously ended up passing the zeropage
into rmap code.  Make sure that won't happen again.

Note that we won't check the huge zeropage for now, which might still end
up in RMAP code.

Link: https://lkml.kernel.org/r/20240522125713.775114-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand
2024-05-22 14:57:13 +02:00
committed by Andrew Morton
parent fce831c920
commit 6ad28e7e52
1 changed files with 3 additions and 0 deletions
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3
include/linux/rmap.h
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@@ -200,6 +200,9 @@ static inline void __folio_rmap_sanity_checks(struct folio *folio,
/* hugetlb folios are handled separately. */
VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio);
/* When (un)mapping zeropages, we should never touch ref+mapcount. */
VM_WARN_ON_FOLIO(is_zero_folio(folio), folio);
/*
* TODO: we get driver-allocated folios that have nothing to do with
* the rmap using vm_insert_page(); therefore, we cannot assume that