Re: [PATCH 01/33] PCI: Prepare to protect against concurrent isolated cpuset change

Jinhui Guo
2026-01-08T08:44:08Z

On Wed Jan 7, 2026 at 13:05:34 -0600, Bjorn Helgaas worte:
> [+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 <frederic@kernel.org>
>
> 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.

Hi Bjorn,

Thanks for pointing out the series.

I’ll resolve the conflicts and send a new patchset once this one is merged.

Best Regards,
Jinhui