linux-kernel - Re: [PATCH 1/3] mm: change vm_get_page_prot() to accept vm_flags

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Message-ID: <73731c15-1464-4705-8ba3-4b4f7d3dff6e@lucifer.local>
Date: Thu, 19 Jun 2025 13:20:16 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Oscar Salvador <osalvador@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@...linux.org.uk>,
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Subject: Re: [PATCH 1/3] mm: change vm_get_page_prot() to accept vm_flags_t
 argument

On Thu, Jun 19, 2025 at 02:12:49PM +0200, Oscar Salvador wrote:
> On Wed, Jun 18, 2025 at 08:42:52PM +0100, Lorenzo Stoakes wrote:
> > We abstract the type of the VMA flags to vm_flags_t, however in may places
>                                                                   many?
> > it is simply assumed this is unsigned long, which is simply incorrect.
> >
> > At the moment this is simply an incongruity, however in future we plan to
> > change this type and therefore this change is a critical requirement for
> > doing so.
> >
> > Overall, this patch does not introduce any functional change.
> >
> > Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
>
> Reviewed-by: Oscar Salvador <osalvador@...e.de>
>
> Same comments as Vlastimil, you want to push vmflag_to_pte_pkey_bits
> further to patch#2 and bring

As I said to him, this is invoked by vm_get_page_prot() so has to be updated too
as a consequence, so it belongs here imo. Also to be (extremely) pedantic if we
were to push it it would be to patch 3/3 :P

>
> arch/powerpc/mm/book3s64/pgtable.c:pgprot_t vm_get_page_prot(unsigned long vm_flags)

Yeah I checked so much and of course, of course... :P

>
>
> --
> Oscar Salvador
> SUSE Labs