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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Sep 17, 2026 at 12:22 PM EDT, Lorenzo Stoakes (ARM) wrote: > It is now an invariant that VMA_IO_BIT is not set except by kernel-owned > mappings, so each existing VMA_SPECIAL_FLAGS test need only test for > VMA_DONTEXPAND_BIT, VMA_PFNMAP_BIT and VMA_MIXEDMAP_BIT. > > This is precisely a test for a kernel-owned or fixed mapping. > > Update a number of callsites which already explicitly handle hugetlb > mappings. > > vma_supports_mlock() and ksm_compatible() also explicitly bail on droppab= le > mappings - detecting kernel-owned, fixed or droppable mappings is handled > by vma_is_persistent(), so in these cases use this predicate. > > should_skip_vma() tests for locked, kernel-owned or fixed memory (having > already excluded hugetlb mappings) so simply test for those there. > > No functional change intended. > > Signed-off-by: Lorenzo Stoakes (ARM) > --- > mm/internal.h | 4 +--- > mm/ksm.c | 4 +--- > mm/vmscan.c | 3 ++- > 3 files changed, 4 insertions(+), 7 deletions(-) > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index 12ed3388ee41..09ff20c3df5b 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -3477,7 +3477,8 @@ static int should_skip_vma(unsigned long start, uns= igned long end, struct mm_wal > if (!vma_has_recency(vma)) > return true; > =20 > - if (vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) > + if (vma_test(vma, VMA_LOCKED_BIT) || vma_is_kernel_owned(vma) || At this point, mmap_lock is held, there is no mlock WIP, so VMA_LOCKED_BIT is enough. > + vma_is_fixed_mapping(vma)) > return true; > =20 > if (vma =3D=3D get_gate_vma(vma->vm_mm)) LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi