Re: [PATCH v4 34/38] mm: eliminate VMA_SPECIAL_FLAGS check in lru_gen_look_around()

A fixed or non-mm-managed 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
mm-managed mappings may not 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.

Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
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=34