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Howlett" , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Mike Rapoport , Michal Hocko , Jonathan Corbet , Randy Dunlap , Jann Horn , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, "Jose A. Perez de Azpillaga" , Daehyeon Ko <4ncienth@gmail.com> Subject: Re: [PATCH v2] mm/vma: avoid spurious write locks when mm->mm_lock_seq overflows Message-Id: <20261019073201.aee381fbbdf2edfdd0a68754@linux-foundation.org> In-Reply-To: References: <20261016-fix-vma-lock-overflow-v2-1-9eb778b79b58@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: 79pp1u399emfo6mprdikkmtdxh73wstp X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: D0A8AA0002 X-Rspam-User: X-HE-Tag: 1792420323-235310 X-HE-Meta: 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 OMz1leas usJQxBAU9+3/0FEFpxh9mVbXUH98Jm2D/y7feOgdoMPEWGA5Og2dmkzlkJaWSXcs0A8Kogn+evsl/dYpv9g6jFODeXSHFK5I1aVx2Eh/lU1/XvefuCeofxABPfACTtTOsRUGE0GMD4Syz3g09EoYddDh5T9OOWzeRVFZjkr1JwAEQO4mwemrKoBoc4kHJXOscE6s1tGdn+DVxBRFnpQE4WVuvUVYKEc+DHSaM7QMll86a+eYVc/JmpCgzyf/gr63soSmIc2reNCZtk0eaTYk9MvF6oZ2K4b6aR3cgGQvSek7Gc4BtHtC0SWHhzzfFYlon43mn/jGrfizk1G3Cr8Q6RoQt1g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 19 Oct 2026 13:19:45 +0100 "Lorenzo Stoakes (ARM)" wrote: > On Mon, Oct 19, 2026 at 10:53:27AM +0100, Pedro Falcato wrote: > > On Fri, Oct 16, 2026 at 12:34:33PM +0100, Lorenzo Stoakes (ARM) wrote: > > > > So I think it's fine to just send it (early :) in the merge window. > > > --- > > > v2: > > > * Updated comment in vma_seqcount_is_write_locked() to mention the VMA > > > being attached. > > > * Renamed reset_vma_seqcounts() to __mm_reset_vma_seqcounts(). > > > * Used acquire semantics in vma_start_reads() to avoid race with reset - > > > there is another acquire immediately after this one so it should just be > > > noise perf-wise. > > > * Removed stable tag, will do the backports manually (just make the value > > > 64 bits...) > > > > I guess you're fitting this where __vm_anon_pgoff_lo now sits? If so, then > > this patch probably wants backporting to 7.3. > > Ack. I added cc:stable to the mm.git copy of this.