[PATCH v3 00/40] mm: make VMA flag semantics explicit, eliminate VM_SPECIAL · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
[PATCH v3 01/40] mm/vma: fix mmap_prepare file handling, remove file_doesnt_need_get · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 01/40] mm/vma: fix mmap_prepare file handling, remove file_doesnt_need_get · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 02/40] mm/vma: predicate setting mmap_prepare VMA fields on new vma alloc · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 02/40] mm/vma: predicate setting mmap_prepare VMA fields on new vma alloc · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 03/40] mm/vma: introduce and use vma_[flags_]can_merge() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 03/40] mm/vma: introduce and use vma_[flags_]can_merge() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 04/40] mm: consistently validate VMA state after mmap[_prepare] hooks · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 04/40] mm: consistently validate VMA state after mmap[_prepare] hooks · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 05/40] mm/vma: ensure mmap_prepare doesn't set actions on a mergeable vma · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 05/40] mm/vma: ensure mmap_prepare doesn't set actions on a mergeable vma · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 06/40] mm: make map_kernel_pages_[prepare,complete] internal and unexported · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 06/40] mm: make map_kernel_pages_[prepare,complete] internal and unexported · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 07/40] mm/vma: tidy up map kernel pages enum values · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 07/40] mm/vma: tidy up map kernel pages enum values · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 08/40] mm: add mmap action for discontiguous kernel page mapping · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 08/40] mm: add mmap action for discontiguous kernel page mapping · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 09/40] docs: filesystems: update mmap_prepare docs for discontig kernel pgs · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 09/40] docs: filesystems: update mmap_prepare docs for discontig kernel pgs · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 10/40] drivers/usb/mon: update to use mmap_prepare + map kernel pages · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 10/40] drivers/usb/mon: update to use mmap_prepare + map kernel pages · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 11/40] infiniband: update hfi1 to use remap_vmalloc_range() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 11/40] infiniband: update hfi1 to use remap_vmalloc_range() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 12/40] selinux: reject writable opens of policy file, drop mmap shared/write check · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 12/40] selinux: reject writable opens of policy file, drop mmap shared/write check · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 13/40] ALSA: pcm: use vm_insert_page() to map PCM status page · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 13/40] ALSA: pcm: use vm_insert_page() to map PCM status page · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 14/40] bpf: arena: mark arena_map_mmap() mappings VM_MIXEDMAP · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 14/40] bpf: arena: mark arena_map_mmap() mappings VM_MIXEDMAP · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 15/40] mm/vma: add vma[_flags]_is_kernel_owned() predicates · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 15/40] mm/vma: add vma[_flags]_is_kernel_owned() predicates · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 16/40] mm/vma: only allow mmap to clear VMA_MAYWRITE_BIT if kernel-owned · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 16/40] mm/vma: only allow mmap to clear VMA_MAYWRITE_BIT if kernel-owned · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 17/40] mm/vma: add and use vma_[flags]_is_fixed_mapping · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 17/40] mm/vma: add and use vma_[flags]_is_fixed_mapping · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 18/40] scsi: sg: convert mmap hook to mmap_prepare and rework · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 18/40] scsi: sg: convert mmap hook to mmap_prepare and rework · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 19/40] fbdev: defio: assert FBINFO_VIRTFB, drop VM_IO, add VM_MIXEDMAP · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 19/40] fbdev: defio: assert FBINFO_VIRTFB, drop VM_IO, add VM_MIXEDMAP · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 20/40] HSI: cmt_speech: convert mmap hook to mmap_prepare, refactor · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 20/40] HSI: cmt_speech: convert mmap hook to mmap_prepare, refactor · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 21/40] mm/gup: error out early on !VMA_MAYREAD_BIT VMAs · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 21/40] mm/gup: error out early on !VMA_MAYREAD_BIT VMAs · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 22/40] uprobes: remove VM_IO, set VM_MIXEDMAP for mapped kernel pages · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 22/40] uprobes: remove VM_IO, set VM_MIXEDMAP for mapped kernel pages · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 23/40] mm/mlock: clear VMA_LOCKED_MASK over mmap callback · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 23/40] mm/mlock: clear VMA_LOCKED_MASK over mmap callback · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 24/40] mm/mlock: eliminate weird VMA_IO_BIT abuse and simplify · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 24/40] mm/mlock: eliminate weird VMA_IO_BIT abuse and simplify · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 25/40] mm/vma: enforce that only kernel-owned mappings may set VMA_IO_BIT · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 25/40] mm/vma: enforce that only kernel-owned mappings may set VMA_IO_BIT · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 26/40] mm: remove VMA_IO_BIT check in vma[_flags]_is_kernel_owned() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 26/40] mm: remove VMA_IO_BIT check in vma[_flags]_is_kernel_owned() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 27/40] mm: remove hugetlb_inline.h · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 27/40] mm: remove hugetlb_inline.h · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 28/40] mm: rename is_vm_hugetlb_page() to vma_is_hugetlb() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 28/40] mm: rename is_vm_hugetlb_page() to vma_is_hugetlb() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 29/40] mm: drop some redundant checks around hugetlb VMAs · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 29/40] mm: drop some redundant checks around hugetlb VMAs · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 30/40] mm/madvise: update is_valid_guard_vma() to use vma_can_merge() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 30/40] mm/madvise: update is_valid_guard_vma() to use vma_can_merge() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 31/40] mm/vma: introduce vma[_flags]_is_persistent() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 31/40] mm/vma: introduce vma[_flags]_is_persistent() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 32/40] mm/uffd: use predicates for userfaultfd checks · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 32/40] mm/uffd: use predicates for userfaultfd checks · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 33/40] mm/madvise: use predicates for madvise(..., MADV_DOFORK) · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 33/40] mm/madvise: use predicates for madvise(..., MADV_DOFORK) · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 34/40] mm: eliminate VMA_SPECIAL_FLAGS usage when hugetlb explicitly tested · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 34/40] mm: eliminate VMA_SPECIAL_FLAGS usage when hugetlb explicitly tested · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 35/40] mm: eliminate VMA_SPECIAL_FLAGS check in lru_gen_look_around() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 35/40] mm: eliminate VMA_SPECIAL_FLAGS check in lru_gen_look_around() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 36/40] mm: avoid use of VMA_SPECIAL_FLAGS in migrate_vma_setup() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 36/40] mm: avoid use of VMA_SPECIAL_FLAGS in migrate_vma_setup() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 37/40] mm: eliminate VM_SPECIAL, VMA_SPECIAL_FLAGS · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 37/40] mm: eliminate VM_SPECIAL, VMA_SPECIAL_FLAGS · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 38/40] fuse: dax: do not set VM_MIXEDMAP · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 38/40] fuse: dax: do not set VM_MIXEDMAP · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 39/40] mm/huge_memory: remove vma_is_special_huge() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 39/40] mm/huge_memory: remove vma_is_special_huge() · sashiko-bot@kernel.org · 2026-09-17
[PATCH v3 40/40] mm/vma: introduce and use vma[_flags]_can_gup() · "Lorenzo Stoakes (ARM)" <ljs@kernel.org> · 2026-09-17
Re: [PATCH v3 40/40] mm/vma: introduce and use vma[_flags]_can_gup() · sashiko-bot@kernel.org · 2026-09-17
Re: [PATCH v3 00/40] mm: make VMA flag semantics explicit, eliminate VM_SPECIAL · Andrew Morton <akpm@linux-foundation.org> · 2026-09-17

Re: [PATCH v3 35/40] mm: eliminate VMA_SPECIAL_FLAGS check in lru_gen_look_around()

From: sashiko-bot@kernel.org
Date: 2026-09-17 17:41:14
Also in: bpf, dri-devel, kvm, kvmarm, linux-perf-users, linux-rdma, linux-s390, linux-scsi, selinux

A kernel-owned or fixed mapping is one which sets VMA_PFNMAP_BIT,
VMA_MIXEDMAP_BIT or VMA_DONTEXPAND_BIT, which is precisely what
VMA_SPECIAL_FLAGS tests for other than VMA_IO_BIT, which is safe to drop as
only kernel-owned mappings may set it.

Using these predicates rather than VMA_SPECIAL_FLAGS makes the check
self-documenting and helps eliminate the confusion around 'special' flags.

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/20260917-b4-mmap-prepare-vma-flag-sanify-v3-0-4583d8a23bca@kernel.org?part=35

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