linux-kernel - Re: [PATCH v3 1/4] mm: declare VMA flags by bit

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Message-ID: <0cda6c54-2ab0-4349-8633-e3eea1306e7f@lucifer.local>
Date: Tue, 13 Jan 2026 19:09:03 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Chris Mason <clm@...a.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
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Subject: Re: [PATCH v3 1/4] mm: declare VMA flags by bit

On Tue, Jan 13, 2026 at 10:51:37AM -0800, Chris Mason wrote:
> On Tue, 25 Nov 2025 10:00:59 +0000 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:
>
> [ ... ]
> >
> > Finally, we update the rust binding helper as now it cannot auto-detect the
> > flags at all.
> >
>
> I did a run of all the MM commits from 6.18 to today's linus, and this one
> had a copy/paste error.   I'd normally just send a patch for this, but in
> terms of showing the review output:
>
> > diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
> > index 2e43c66635a2c..4c327db01ca03 100644
> > --- a/rust/bindings/bindings_helper.h
> > +++ b/rust/bindings/bindings_helper.h
> > @@ -108,7 +108,32 @@ const xa_mark_t RUST_CONST_HELPER_XA_PRESENT = XA_PRESENT;
>
> [ ... ]
>
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYREAD = VM_MAYREAD;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYWRITE = VM_MAYWRITE;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYEXEC = VM_MAYEXEC;
> > +const vm_flags_t RUST_CONST_HELPER_VM_MAYSHARE = VM_MAYEXEC;
>                                                    ^^^^^^^^^^
>
> Should this be VM_MAYSHARE instead of VM_MAYEXEC? This appears to be a
> copy-paste error that would cause Rust code using VmFlags::MAYSHARE to
> get bit 6 (VM_MAYEXEC) instead of bit 7 (VM_MAYSHARE).
>
> The pattern of the preceding lines shows each constant should reference
> its matching flag:
>
>     RUST_CONST_HELPER_VM_MAYREAD  = VM_MAYREAD
>     RUST_CONST_HELPER_VM_MAYWRITE = VM_MAYWRITE
>     RUST_CONST_HELPER_VM_MAYEXEC  = VM_MAYEXEC
>     RUST_CONST_HELPER_VM_MAYSHARE = VM_MAYSHARE  <- expected
>
> > +const vm_flags_t RUST_CONST_HELPER_VM_PFNMAP = VM_PFNMAP;
>
> [ ... ]
>
>

Oopsies!

I can send a patch unless you were planning to!

Cheers, Lorenzo