linux-kernel - RE: [PATCH v2 06/10] x86/mce: Convert multiple if () statements into a switch() statement

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Message-ID: <SJ1PR11MB6083262976EDEC69FFF449FAFC432@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date: Mon, 21 Oct 2024 16:06:47 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>, "Mehta, Sohil"
	<sohil.mehta@...el.com>
CC: "bp@...en8.de" <bp@...en8.de>, "tglx@...utronix.de" <tglx@...utronix.de>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"mingo@...hat.com" <mingo@...hat.com>, "hpa@...or.com" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>, "linux-edac@...r.kernel.org"
	<linux-edac@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 06/10] x86/mce: Convert multiple if () statements into
 a switch() statement

>         /*
>          * All newer Intel systems support MCE broadcasting. Enable
>          * synchronization with a one second timeout.
>          */
> -       if ((c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xe)) &&
> -           cfg->monarch_timeout < 0)
> +       if (c->x86_vfm >= INTEL_CORE_YONAH && cfg->monarch_timeout < 0)
>                 cfg->monarch_timeout = USEC_PER_SEC;

This change is correct. But the old code makes it more explicit that
CPUs in families > 6 take this action. As the author of the VFM changes
it's clear to me, maybe less so to others?

But maybe its OK.  The comment does help a lot. Anyone else have thoughts on this?

-Tony