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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org, Jinhui Guo Subject: Re: [PATCH 01/33] PCI: Prepare to protect against concurrent isolated cpuset change Message-ID: <20260107190534.GA441483@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260101221359.22298-2-frederic@kernel.org> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 34202A0009 X-Stat-Signature: 5tzog8fffsgfaqngqt7hrkf3oe5jsdww X-Rspam-User: X-HE-Tag: 1767812736-297163 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: [+cc Jinhui] On Thu, Jan 01, 2026 at 11:13:26PM +0100, Frederic Weisbecker wrote: > HK_TYPE_DOMAIN will soon integrate cpuset isolated partitions and > therefore be made modifiable at runtime. Synchronize against the cpumask > update using RCU. > > The RCU locked section includes both the housekeeping CPU target > election for the PCI probe work and the work enqueue. > > This way the housekeeping update side will simply need to flush the > pending related works after updating the housekeeping mask in order to > make sure that no PCI work ever executes on an isolated CPU. This part > will be handled in a subsequent patch. > > Signed-off-by: Frederic Weisbecker Just FYI, Jinhui posted a series that touches this same code and might need some coordination: https://lore.kernel.org/r/20260107175548.1792-1-guojinhui.liam@bytedance.com IIUC, Jinhui's series adds some more NUMA smarts in the driver core sync probing path and removes corresponding NUMA code from the PCI core probe path. Bjorn