Re: [PATCH v2 13/13] mm/mremap: convert mremap code to use vma_flags_t

[Vlastimil Babka (SUSE)]

On 7/11/26 20:45, Lorenzo Stoakes wrote:
> 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.
> 
> Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
> Signed-off-by: Lorenzo Stoakes <ljs@xxxxxxxxxx>

Reviewed-by: Vlastimil Babka (SUSE) <vbabka@xxxxxxxxxx>