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

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Message-Id: <20260122074807.eccc6080b8d8ca5fc37b2a62@linux-foundation.org>
Date: Thu, 22 Jan 2026 07:48:07 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
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, 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.