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Tue, 1 Apr 2025 05:53:07 +0000 Message-ID: Date: Mon, 31 Mar 2025 22:53:04 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/9] x86/nmi: Fix comment in unknown NMI handling Content-Language: en-US To: "H. Peter Anvin" , "Huang, Kai" , "tglx@linutronix.de" , "mingo@redhat.com" , "x86@kernel.org" CC: "Nikula, Jani" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "peterz@infradead.org" , "linux-kernel@vger.kernel.org" , "kirill.shutemov@linux.intel.com" , "rppt@kernel.org" , "bigeasy@linutronix.de" , "jpoimboe@kernel.org" , "pmladek@suse.com" , "xin@zytor.com" , "Luck, Tony" References: <20250327234629.3953536-1-sohil.mehta@intel.com> <20250327234629.3953536-6-sohil.mehta@intel.com> <4e7937e946d94d5f62ff1a5f3b416f7d1eb2c71f.camel@intel.com> From: Sohil Mehta In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR03CA0001.namprd03.prod.outlook.com (2603:10b6:a02:a8::14) To BYAPR11MB3320.namprd11.prod.outlook.com (2603:10b6:a03:18::25) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3320:EE_|CH3PR11MB8750:EE_ X-MS-Office365-Filtering-Correlation-Id: 4015cad7-d575-44a3-ea20-08dd70e179c6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; 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Peter Anvin wrote: > Ha! Any idea what it was *supposed* to do? I'm guessing it stood for "back to back" or some such? Yes, it stands for back to back NMIs. I added additional comments to clarify how they are detected. https://lore.kernel.org/lkml/20250327234629.3953536-7-sohil.mehta@intel.com/ nmi_handle() still has special handling for back to back NMIs. But at some point, there was a b2b parameter that was passed to nmi_handle(). AFAICT, that parameter was never really used. Sohil