linux-kernel - Re: [PATCH v3 1/8] mm: introduce VM_MAYBE_GUARD and make visible in /proc/$pid/smaps

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Message-ID: <6ea6d33b-be16-4a00-9b0b-ce4a5dbecbd7@lucifer.local>
Date: Tue, 18 Nov 2025 07:33:18 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: jane.chu@...cle.com
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, David Hildenbrand <david@...hat.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
        Zi Yan <ziy@...dia.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
        Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
        Lance Yang <lance.yang@...ux.dev>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-trace-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Andrei Vagin <avagin@...il.com>
Subject: Re: [PATCH v3 1/8] mm: introduce VM_MAYBE_GUARD and make visible in
 /proc/$pid/smaps

On Mon, Nov 17, 2025 at 05:05:26PM -0800, jane.chu@...cle.com wrote:
>
>
> On 11/7/2025 8:11 AM, Lorenzo Stoakes wrote:
[snip]
> > diff --git a/mm/memory.c b/mm/memory.c
> > index 046579a6ec2f..334732ab6733 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -1480,6 +1480,10 @@ vma_needs_copy(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma)
> >   	if (src_vma->anon_vma)
> >   		return true;
> > +	/* Guard regions have momdified page tables that require copying. */
>
> Nit:  s/momdified/modified.

Thanks, Liam mentioned this too and I forgot to fix too, going to respin and
resolve :) I must have been tired :P

Cheers, Lorenzo