linux-kernel - Re: [PATCH RESEND v3 00/10] mm: add and use vma_assert

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Message-ID: <af4f2048-1176-4b3b-954f-09fdc7275348@lucifer.local>
Date: Thu, 22 Jan 2026 15:57:35 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...nel.org>,
        "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>,
        Shakeel Butt <shakeel.butt@...ux.dev>, Jann Horn <jannh@...gle.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-rt-devel@...ts.linux.dev, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>, Waiman Long <longman@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Clark Williams <clrkwllms@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH RESEND v3 00/10] mm: add and use vma_assert_stabilised()
 helper

On Thu, Jan 22, 2026 at 07:48:07AM -0800, Andrew Morton wrote:
> On Thu, 22 Jan 2026 13:01:52 +0000 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:
>
> > Sometimes we wish to assert that a VMA is stable, that is - the VMA cannot
> > be changed underneath us. This will be the case if EITHER the VMA lock or
> > the mmap lock is held.
> >
> > We already open-code this in two places - anon_vma_name() in mm/madvise.c
> > and vma_flag_set_atomic() in include/linux/mm.h.
> >
> > This series adds vma_assert_stablised() which abstract this can be used in
> > these callsites instead.
>
> Thanks, I added this to mm,git's mm-new branch.
>
> It conflicts somewhat with your series "mm: add bitmap VMA flag helpers
> and convert all mmap_prepare to use them".  I believe that a new
> version of that series is in the works so I removed it instead of
> attempting to fix things up.  Please lmk if I should attempt to perform
> the repairs.
>

Thanks, I'm about to send that.

The conflicts hopefully shouldn't be too bad, let me know if you need any
help with conflict resolution!

Cheers, Lorenzo