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mm/memory: remove PageAnonExclusive sanity-check in restore_exclusive_pte()

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In commit b832a354d7 ("mm/memory: page_add_anon_rmap() ->
folio_add_anon_rmap_pte()") we accidentally changed the sanity check to
essentially ignore anonymous folio by mis-placing the "!" ...  but we
really always only get anonymous folios in restore_exclusive_pte().

However, in the meantime we removed the separate "writable
device-exclusive entries" and always detect if the PTE can be writable
using can_change_pte_writable() -- which also consults PageAnonExclusive.

So let's just get rid of this sanity check completely.

Link: https://lkml.kernel.org/r/20250226132257.2826043-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2025-02-26 14:22:54 +01:00 committed by Andrew Morton
parent 66add5e909
commit db0f6e674c
1 changed files with 0 additions and 3 deletions
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3
mm/memory.c
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@ -738,9 +738,6 @@ static void restore_exclusive_pte(struct vm_area_struct *vma,
pte = pte_mkdirty(pte);
pte = pte_mkwrite(pte, vma);
}
VM_BUG_ON_FOLIO(pte_write(pte) && (!folio_test_anon(folio) &&
PageAnonExclusive(page)), folio);
set_pte_at(vma->vm_mm, address, ptep, pte);
/*