Re: [PATCH v4 31/38] mm/uffd: use predicates for userfaultfd checks
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From: sashiko-bot@kernel.org
Date: 2026-10-03 17:57:12
Also in:
bpf, dri-devel, kvm, kvmarm, linux-perf-users, linux-rdma, linux-s390, linux-scsi, selinux
Rather than directly checking VMA flags, use the newly introduced vma_is_mm_managed() and vma_is_mm_backed() helpers in userfaultfd when assessing VMA suitability for userfaultfd and UFFDIO_MOVE. Update vma_move_compatible() so it's expressed in terms of VMA characteristics rather than arbitrary flags. Additionally, update the use of the deprecated VMA flag API when checking VMA_SHADOW_STACK_BIT. A VMA_IO_BIT check is no longer required but that is fine as a hard invariant has been established that mm-managed mappings may not set VMA_IO_BIT so the check is now redundant. Acked-by: Zi Yan <ziy@nvidia.com> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great! -- Sashiko AI review · https://sashiko.dev/#/patchset/20261003-b4-mmap-prepare-vma-flag-sanify-v4-0-a1f052500fd7@kernel.org?part=31