linux-kernel - Re: [PATCH] ACPI/MRRM: Fix default max memory region

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Message-ID: <CAJZ5v0ifTUBq3KGBAZOTb4AoV5aL2VDWBWQqj6gZxcC+QFE2zA@mail.gmail.com>
Date: Fri, 23 May 2025 20:07:13 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: "Luck, Tony" <tony.luck@...el.com>, 
	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
Cc: "Chen, Yu C" <yu.c.chen@...el.com>, "lenb@...nel.org" <lenb@...nel.org>, 
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: Re: [PATCH] ACPI/MRRM: Fix default max memory region

On Fri, May 23, 2025 at 7:48 PM Luck, Tony <tony.luck@...el.com> wrote:
>
> > Per the spec, the default max memory region must be 1 covering
> > all system memory.
> >
> > When platform does not provide ACPI MRRM table or
> > when CONFIG_ACPI is opted out, the acpi_mrrm_max_mem_region() function
> > defaults to  returning 1 region complying to RDT spec.
> >
> > Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
>
> Good (corner case) catch. I was too focused on the assumption that MRRM
> table will be present when needed. Always a good plan to have a backup
> option if BIOS does something strange.
>
> Reviewed-by: Tony Luck <tony.luck@...el.com>

Applied, thanks!