linux-kernel - Re: [PATCH v3 4/5] dax/hmem: Defer Soft Reserved overlap handling until CXL region assembly completes

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Message-ID: <aOR01dEJJgt0et_M@aschofie-mobl2.lan>
Date: Mon, 6 Oct 2025 19:03:01 -0700
From: Alison Schofield <alison.schofield@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nvdimm@...ts.linux.dev>, <linux-fsdevel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>, Davidlohr Bueso <dave@...olabs.net>, "Jonathan
 Cameron" <jonathan.cameron@...wei.com>, Dave Jiang <dave.jiang@...el.com>,
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	"Dan Williams" <dan.j.williams@...el.com>, Matthew Wilcox
	<willy@...radead.org>, Jan Kara <jack@...e.cz>, "Rafael J . Wysocki"
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	Zhijian Li <lizhijian@...itsu.com>, "Borislav Petkov" <bp@...en8.de>, Ard
 Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH v3 4/5] dax/hmem: Defer Soft Reserved overlap handling
 until CXL region assembly completes

On Mon, Oct 06, 2025 at 06:27:12PM -0700, Alison Schofield wrote:

snip

> > +
> > +	/* relies on cxl_acpi and cxl_pci having had a chance to load */
> > +	wait_for_device_probe();
> 
> The wait_for_device_probe() didn't wait for region probe to complete.
> I couldn't figure out why, so I just 'slept' here in my testing. 
> How is that suppose work? Could I have something config'd wrong?

FWIW I tried region driver with .probe_type = PROBE_PREFER_ASYNCHRONOUS,
but no luck.

snip