linux-kernel - Re: [PATCH 1/6] dax/hmem, e820, resource: Defer Soft Reserved registration until hmem is ready

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Message-ID: <68bf603dee8ff_75e31001d@dwillia2-mobl4.notmuch>
Date: Mon, 8 Sep 2025 16:01:17 -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>,
	<ardb@...nel.org>, <bp@...en8.de>
Subject: Re: [PATCH 1/6] dax/hmem, e820, resource: Defer Soft Reserved
 registration until hmem is ready

[ add Boris and Ard ]

Ard, Boris, can you have a look at the touches to early e820/x86 init
(insert_resource_late()) and give an ack (or nak). The general problem
here is conflicts between e820 memory resources and CXL subsystem memory
resources.

Smita Koralahalli wrote:
> Insert Soft Reserved memory into a dedicated soft_reserve_resource tree
> instead of the iomem_resource tree at boot.
> 
> Publishing Soft Reserved ranges into iomem too early causes conflicts with
> CXL hotplug and region assembly failure, especially when Soft Reserved
> overlaps CXL regions.
> 
> Re-inserting these ranges into iomem will be handled in follow-up patches,
> after ensuring CXL window publication ordering is stabilized and when the
> dax_hmem is ready to consume them.
> 
> This avoids trimming or deleting resources later and provides a cleaner
> handoff between EFI-defined memory and CXL resource management.
> 
> Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>


> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Smita, if you added changes this should have Co-developed-by. Otherwise
plain Signed-off-by is interpreted as only chain of custody.  Any other
patches that you add my Signed-off-by to should also have
Co-developed-by or be From: me.

Alternatively if you completely rewritel a patch with your own approach
then note the source (with a Link:) and leave off the original SOB.

Lastly, in this case it looks unmodified from what I wrote? Then it
should be:

From: Dan Williams <dan.j.williams@...el.com>

Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>

...to show the chain of custody of you forwarding a diff authored
completely by someone else.