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

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Message-Id: <20260108084326.1952-1-guojinhui.liam@bytedance.com>
Date: Thu,  8 Jan 2026 16:43:26 +0800
From: "Jinhui Guo" <guojinhui.liam@...edance.com>
To: <helgaas@...nel.org>
Cc: <akpm@...ux-foundation.org>, <axboe@...nel.dk>, <bhelgaas@...gle.com>, 
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Subject: Re: [PATCH 01/33] PCI: Prepare to protect against concurrent isolated cpuset change

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@...nel.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