linux-kernel - Re: [PATCH] x86/mce: Handle varying MCA bank counts

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Date:   Fri, 27 Jul 2018 15:08:34 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Yazen Ghannam <Yazen.Ghannam@....com>
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        bp@...e.de, x86@...nel.org
Subject: Re: [PATCH] x86/mce: Handle varying MCA bank counts

On Fri, Jul 27, 2018 at 04:40:09PM -0500, Yazen Ghannam wrote:
> -	/* Don't support asymmetric configurations today */
> -	WARN_ON(mca_cfg.banks != 0 && b != mca_cfg.banks);
> -	mca_cfg.banks = b;
> +	mca_cfg.banks = max(mca_cfg.banks, b);

Should we change mca_cfg.banks to be a per-cpu variable?

	DEFINE_PER_CPU(int, mce_num_banks);

That would make it easier to make sure the places
that scan all banks only look at the ones that exist.

-Tony