linux-kernel - Re: [PATCH v2] ACPI: NUMA: debug invalid unused PXM value for CFMWs

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Message-ID: <20250314101226.00003830@huawei.com>
Date: Fri, 14 Mar 2025 10:12:26 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Gregory Price <gourry@...rry.net>
CC: Yuquan Wang <wangyuquan1236@...tium.com.cn>, <rafael@...nel.org>,
	<lenb@...nel.org>, <dave@...olabs.net>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<ira.weiny@...el.com>, <dan.j.williams@...el.com>, <rrichter@....com>,
	<bfaccini@...dia.com>, <rppt@...nel.org>, <haibo1.xu@...el.com>,
	<chenbaozi@...tium.com.cn>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [PATCH v2] ACPI: NUMA: debug invalid unused PXM value for CFMWs

On Thu, 13 Mar 2025 11:02:37 -0400
Gregory Price <gourry@...rry.net> wrote:

> On Thu, Mar 13, 2025 at 02:09:07PM +0800, Yuquan Wang wrote:
> > @@ -441,6 +441,11 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
> >  	start = cfmws->base_hpa;
> >  	end = cfmws->base_hpa + cfmws->window_size;
> >  
> > +	if (srat_disabled()) {
> > +		pr_err("SRAT is missing or bad while processing CFMWS.\n");
> > +		return -EINVAL;
> > +	}
> > +  
> 
> I thought the srat was optional regardless of the presence of a CFMWS.
> Is this not the case?

True in theory, but do we want to support it?

I'd vote no unless someone is shipping such a system and can't fix it up.

Jonathan


> 
> ~Gregory
>