linux-kernel - Re: [PATCH 2/4] x86/mce: Get rid of machine_check

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Message-ID: <YUgUpXHciLMn4X20@agluck-desk2.amr.corp.intel.com>
Date:   Sun, 19 Sep 2021 21:57:09 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] x86/mce: Get rid of machine_check_vector

On Fri, Sep 17, 2021 at 12:53:53PM +0200, Borislav Petkov wrote:
> @@ -126,7 +123,9 @@ struct mca_config {
>  	      ser			: 1,
>  	      recovery			: 1,
>  	      bios_cmci_threshold	: 1,
> -	      __reserved		: 59;
> +	      /* Proper #MC exception handler is set */
> +	      initialized		: 1,
> +	      __reserved		: 58;

Does this __reserved field do anything useful? It seems to
just be an annoyance that must be updated each time a new
bit is added. Surely the compiler will see that these bitfields
are in a "u64" and do the math and skip to the right boundary
without this.

-Tony