linux-kernel - Re: [PATCH RFC v3 03/21] ACPI: processor: Register CPUs that are online, but not described in the DSDT

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Message-ID: <ZbfFG5JLnAkGN1pk@shell.armlinux.org.uk>
Date: Mon, 29 Jan 2024 15:32:43 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
	loongarch@...ts.linux.dev, linux-acpi@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev,
	x86@...nel.org, acpica-devel@...ts.linuxfoundation.org,
	linux-csky@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
	Salil Mehta <salil.mehta@...wei.com>,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	jianyong.wu@....com, justin.he@....com,
	James Morse <james.morse@....com>, vishnu@...amperecomputing.com,
	miguel.luis@...cle.com
Subject: Re: [PATCH RFC v3 03/21] ACPI: processor: Register CPUs that are
 online, but not described in the DSDT

On Mon, Jan 29, 2024 at 01:03:54PM +0000, Jonathan Cameron wrote:
> I poked this on x86 - it only applies with hotplug enabled anyway so
> same result as doing the hotplug later - All possible Processor() entries
> already exist in DSDT. Hence this isn't the source of the mysterious
> broken configuration.
> 
> If anyone does poke this path, the old discussion between James
> and Salil provides some instructions (mostly the thread is about
> another issue).
> https://op-lists.linaro.org/archives/list/linaro-open-discussions@op-lists.linaro.org/thread/DNAGB2FB5ALVLV2BYWYOCLKGNF77PNXS/
> 
> Also on x86 a test involving smp 2,max-cpus=4 and adding cpu-id 3
> (so skipping 2) doesn't boot. (this is without Salil's QEMU patches).
> I guess there are some well known rules in there that I don't know about
> and QEMU isn't preventing people shooting themselves in the foot.
> 
> As I'm concerned, drop this patch.
> If there are platforms out there doing this wrong they'll surface once
> we get this into more test farms (so linux-next).  If we need this
> 'fix' we can apply it when we have a problem firmware to point at.

Now dropped.

-- 
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