linux-kernel - Re: [PATCH v3 02/23] x86/numa: Add 'nohmat' option

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Date:   Fri, 31 Jul 2020 20:51:06 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>, akpm@...ux-foundation.org
Cc:     x86@...nel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, vishal.l.verma@...el.com,
        ard.biesheuvel@...aro.org, linux-mm@...ck.org,
        linux-nvdimm@...ts.01.org, joao.m.martins@...cle.com,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3 02/23] x86/numa: Add 'nohmat' option

On 7/31/20 8:25 PM, Dan Williams wrote:
> Disable parsing of the HMAT for debug, to workaround broken platform
> instances, or cases where it is otherwise not wanted.
> 
> ---
>  arch/x86/mm/numa.c       |    2 ++
>  drivers/acpi/numa/hmat.c |    8 +++++++-
>  include/acpi/acpi_numa.h |    8 ++++++++
>  3 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 87c52822cc44..f3805bbaa784 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -41,6 +41,8 @@ static __init int numa_setup(char *opt)
>  		return numa_emu_cmdline(opt + 5);
>  	if (!strncmp(opt, "noacpi", 6))
>  		disable_srat();
> +	if (!strncmp(opt, "nohmat", 6))
> +		disable_hmat();

Hopefully that will be documented in
Documentation/x86/x86_64/boot-options.rst.

>  	return 0;
>  }
>  early_param("numa", numa_setup);

thanks.
-- 
~Randy