linux-kernel - Re: [PATCH 3/6] EDAC/amd64: Save max number of controllers to family type

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Date:   Mon, 21 Oct 2019 16:40:12 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>
Cc:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] EDAC/amd64: Save max number of controllers to family
 type

On Fri, Oct 18, 2019 at 03:31:26PM +0000, Ghannam, Yazen wrote:
> From: Yazen Ghannam <yazen.ghannam@....com>
> 
> The maximum number of memory controllers is fixed within a family/model
> group. In most cases, this has been fixed at 2, but some systems may
> have up to 8.
> 
> The struct amd64_family_type already contains family/model-specific
> information, and this can be used rather than adding model checks to
> various functions.
> 
> Create a new field in struct amd64_family_type for max_num_controllers.
> Set this when setting other family type information, and use this when
> needing the maximum number of memory controllers possible for a system.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
> Link:
> https://lkml.kernel.org/r/20190821235938.118710-9-Yazen.Ghannam@amd.com

...

> diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
> index 8c3cda81e619..0d5a9bc4d6de 100644
> --- a/drivers/edac/amd64_edac.h
> +++ b/drivers/edac/amd64_edac.h
> @@ -479,6 +479,7 @@ struct low_ops {
>  struct amd64_family_type {
>  	const char *ctl_name;
>  	u16 f0_id, f1_id, f2_id, f6_id;
> +	u8 max_num_controllers;

Sure but call that max_mcs or so, so that the code which mentions it,
doesn't stick out too much. You can put a comment above it here to
explain what it is:

	/* Maximum number of memory controllers per node */
	u8 max_mcs;

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette