Re: [PATCH 33/39] mm: eliminate VMA_SPECIAL_FLAGS usage when hugetlb explicitly tested
From: sashiko-bot@kernel.org
Date: 2026-09-08 20:42:56
Also in:
bpf, dri-devel, kvm, kvmarm, linux-perf-users, linux-s390, linux-scsi, selinux
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 droppable 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) <ljs@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great! -- Sashiko AI review · https://sashiko.dev/#/patchset/20260908-b4-mmap-prepare-vma-flag-sanify-v1-0-dacf19cce22b@kernel.org?part=33