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Thu, 24 Oct 2024 21:31:50 +0000 Message-ID: Date: Thu, 24 Oct 2024 14:31:49 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 06/10] x86/mce: Convert multiple if () statements into a switch() statement To: "Luck, Tony" , "Zhuo, Qiuxu" , "Hansen, Dave" CC: "bp@alien8.de" , "tglx@linutronix.de" , "dave.hansen@linux.intel.com" , "mingo@redhat.com" , "hpa@zytor.com" , "x86@kernel.org" , "linux-edac@vger.kernel.org" , "linux-kernel@vger.kernel.org" References: <20241010153202.30876-1-qiuxu.zhuo@intel.com> <20241016123036.21366-1-qiuxu.zhuo@intel.com> <20241016123036.21366-7-qiuxu.zhuo@intel.com> <2d011a77-a46e-4589-ae91-80d8d29e4124@intel.com> Content-Language: en-US From: Sohil Mehta In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR01CA0053.prod.exchangelabs.com (2603:10b6:a03:94::30) To BYAPR11MB3320.namprd11.prod.outlook.com (2603:10b6:a03:18::25) Precedence: bulk X-Mailing-List: linux-edac@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3320:EE_|DS0PR11MB7460:EE_ X-MS-Office365-Filtering-Correlation-Id: 42f28bc1-1a57-4523-bd8e-08dcf4734531 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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> > Updated code now matches for families before 6 (486, Pentium). 486 would never get > to this code. But I think from the comments about machine check bank 0 being magic > that Pentium had some rudimentary support. > As you mentioned it yourself (the last time I was concerned about family 5), the following check should cover this scenario? > @@ -1924,6 +1924,10 @@ static void apply_quirks_intel(struct cpuinfo_x86 *c) > struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array); > struct mca_config *cfg = &mca_cfg; > > + /* Older CPUs (prior to family 6) don't need quirks. */ > + if (c->x86_vfm < INTEL_PENTIUM_PRO) > + return; > + Sohil