Re: [PATCH 06/13] mm/vma: convert vm_pgprot_modify() to use vma_flags_t and rename

[Lance Yang]

On Mon, Jun 29, 2026 at 08:25:29PM +0100, Lorenzo Stoakes wrote:
>Update vm_pgprot_modify() to use the new VMA flags type vma_flags_t, and
>rename to vma_pgprot_modify() accordingly.
>
>This is part of the ongoing work to convert vm_flags_t to vma_flags_t, in
>order to eliminate the arbitrary limit of the number of bits in a system
>word on available VMA flags.
>
>Update VMA userland tests accordingly, updating vma_set_page_prot() to no
>longer inline vma_pgprot_modify(), rather we can simply define
>vma_pgprot_modify() as a static inline function and the tests will pick it
>up from vma.h.
>
>No functional change intended.
>
>Signed-off-by: Lorenzo Stoakes <ljs@xxxxxxxxxx>
>---
[...]
>diff --git a/mm/vma.h b/mm/vma.h
>index bcf0c2773449..6a8abb8ae937 100644
>--- a/mm/vma.h
>+++ b/mm/vma.h
>@@ -522,9 +522,11 @@ static inline bool vma_wants_manual_pte_write_upgrade(struct vm_area_struct *vma
> }
> 
> #ifdef CONFIG_MMU
>-static inline pgprot_t vm_pgprot_modify(pgprot_t oldprot, vm_flags_t vm_flags)
>+static inline pgprot_t vma_pgprot_modify(pgprot_t oldprot, vma_flags_t vma_flags)
> {
>-	return pgprot_modify(oldprot, vm_get_page_prot(vm_flags));
>+	const pgprot_t prot = vma_get_page_prot(vma_flags);
>+
>+	return pgprot_modify(oldprot, prot);

Nit: could this just stay as a single return? something like:

return pgprot_modify(oldprot, vma_get_page_prot(vma_flags));

Otherwise, LGTM, feel free to add: 

Reviewed-by: Lance Yang <lance.yang@xxxxxxxxx>

[...]