linux-kernel - Re: [PATCH 1/4] x86/mce: Define 'SUCCOR' cpuid bit

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Message-ID: <55439734.1070709@linux.intel.com>
Date:	Fri, 01 May 2015 08:09:40 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	tony.luck@...el.com, bp@...en8.de, jiang.liu@...ux.intel.com,
	yinghai@...nel.org
CC:	x86@...nel.org, dvlasenk@...hat.com, JBeulich@...e.com,
	slaoub@...il.com, luto@...capital.net, oleg@...hat.com,
	rostedt@...dmis.org, rusty@...tcorp.com.au, prarit@...hat.com,
	linux@...musvillemoes.dk, jroedel@...e.de,
	andriy.shevchenko@...ux.intel.com, macro@...ux-mips.org,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	linux-edac@...r.kernel.org
Subject: Re: [PATCH 1/4] x86/mce: Define 'SUCCOR' cpuid bit

On 04/30/2015 07:49 AM, Aravind Gopalakrishnan wrote:
> @@ -1640,6 +1640,7 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
>  	case X86_VENDOR_AMD:
>  		mce_amd_feature_init(c);
>  		mce_flags.overflow_recov = cpuid_ebx(0x80000007) & 0x1;
> +		mce_flags.succor = (cpuid_ebx(0x80000007) & 0x2) ? 1 : 0;
>  		break;
>  	default:
>  		break;

Is there a reason to add the cpuid detection like this instead of adding
an X86_FEATURE_ for it and using cpu_has() and friends?  Doing that
would also let you see the bit in /proc/cpuinfo.
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