linux-kernel - Re: [PATCH v4 2/9] mm: add atomic VMA flags and set VM_MAYBE

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Message-ID: <91396181-1813-4ea1-a081-06f97e703be3@linux.dev>
Date: Thu, 20 Nov 2025 14:11:39 +0800
From: Lance Yang <lance.yang@...ux.dev>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: 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>,
 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>, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 2/9] mm: add atomic VMA flags and set VM_MAYBE_GUARD as
 such

On 2025/11/18 18:17, Lorenzo Stoakes wrote:
> This patch adds the ability to atomically set VMA flags with only the mmap
> read/VMA read lock held.
> 
> As this could be hugely problematic for VMA flags in general given that
> all other accesses are non-atomic and serialised by the mmap/VMA locks, we
> implement this with a strict allow-list - that is, only designated flags
> are allowed to do this.
> 
> We make VM_MAYBE_GUARD one of these flags.
> 
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Reviewed-by: Pedro Falcato <pfalcato@...e.de>
> Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
> ---

LGTM! Feel free to add:

Reviewed-by: Lance Yang <lance.yang@...ux.dev>