linux-kernel - Re: [PATCH v5 2/7] cxl/core: Rename suspend.c to probe_state.c and remove CONFIG_CXL

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Message-ID: <68800627676e1_137e6b100fd@dwillia2-xfh.jf.intel.com.notmuch>
Date: Tue, 22 Jul 2025 14:44:07 -0700
From: <dan.j.williams@...el.com>
To: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
	<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nvdimm@...ts.linux.dev>, <linux-fsdevel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>
CC: Davidlohr Bueso <dave@...olabs.net>, Jonathan Cameron
	<jonathan.cameron@...wei.com>, Dave Jiang <dave.jiang@...el.com>, "Alison
 Schofield" <alison.schofield@...el.com>, Vishal Verma
	<vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Dan Williams
	<dan.j.williams@...el.com>, Matthew Wilcox <willy@...radead.org>, Jan Kara
	<jack@...e.cz>, "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown
	<len.brown@...el.com>, Pavel Machek <pavel@...nel.org>, Li Ming
	<ming.li@...omail.com>, Jeff Johnson <jeff.johnson@....qualcomm.com>, "Ying
 Huang" <huang.ying.caritas@...il.com>, Yao Xingtao <yaoxt.fnst@...itsu.com>,
	Peter Zijlstra <peterz@...radead.org>, Greg KH <gregkh@...uxfoundation.org>,
	Nathan Fontenot <nathan.fontenot@....com>, Smita Koralahalli
	<Smita.KoralahalliChannabasappa@....com>, Terry Bowman
	<terry.bowman@....com>, Robert Richter <rrichter@....com>, Benjamin Cheatham
	<benjamin.cheatham@....com>, PradeepVineshReddy Kodamati
	<PradeepVineshReddy.Kodamati@....com>, Zhijian Li <lizhijian@...itsu.com>
Subject: Re: [PATCH v5 2/7] cxl/core: Rename suspend.c to probe_state.c and
 remove CONFIG_CXL_SUSPEND

Smita Koralahalli wrote:
> The cxl_mem_active_inc()/dec() and cxl_mem_active() helpers were initially
> introduced to coordinate suspend/resume behavior. However, upcoming
> changes will reuse these helpers to track cxl_mem_probe() activity during
> SOFT RESERVED region handling.
> 
> To reflect this broader purpose, rename suspend.c to probe_state.c and
> remove CONFIG_CXL_SUSPEND Kconfig option. These helpers are now always
> built into the CXL core subsystem.
> 
> This ensures drivers like cxl_acpi to coordinate with cxl_mem for
> region setup and hotplug handling.

I struggle to see how blocking suspend in the presence of CXL memory has
anything to do with soft-reserve handling? Maybe the story is in a
follow-on patch.