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mm/mremap: convert mremap code to use vma_flags_t

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Replace use of the legacy vm_flags_t flags with vma_flags_t values
throughout the mremap logic.

Note that, in replacing vm_flags_clear() (which takes the VMA write lock)
with vma_clear_flags() and vma_clear_flags_mask() (which do not)
respectively in unmap_source_vma() and dontunmap_complete(), we do not add
a VMA write lock to account for htis.

This is because, in both cases, move_vma() is their calling function and
this has already acquired the VMA write lock on vrm->vma whose VMA flags
are being cleared.

In the case of vma_set_flags() in unmap_source_vma() we do need to do this
- as prev and next were not necessarily write locked at this point.

Additionally update comments to reflect the changes to be consistent.

No functional change intended.

Link: https://lore.kernel.org/20260711-b4-vma-flags-mm-v2-13-0fa2357d5431@kernel.org
Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Dave Airlie <airlied@gmail.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nico Pache <npache@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2026-07-11 19:45:10 +01:00 • committed by Andrew Morton
commit f4a31afd96
1 changed files with 20 additions and 18 deletions
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