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Received: from DM6PR12MB2667.namprd12.prod.outlook.com (2603:10b6:5:42::28) by CH2PR12MB4245.namprd12.prod.outlook.com (2603:10b6:610:af::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9182.20; Sun, 5 Oct 2025 21:09:02 +0000 Received: from DM6PR12MB2667.namprd12.prod.outlook.com ([fe80::bd88:b883:813d:54a2]) by DM6PR12MB2667.namprd12.prod.outlook.com ([fe80::bd88:b883:813d:54a2%6]) with mapi id 15.20.9182.017; Sun, 5 Oct 2025 21:09:02 +0000 Message-ID: <46bfa3cb-3f8a-4780-bf69-c6fedd673649@nvidia.com> Date: Sun, 5 Oct 2025 14:08:59 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 16/29] arm_mpam: Add a helper to touch an MSC from any CPU To: James Morse , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Dave Martin , Koba Ko , Shanker Donthineni , baisheng.gao@unisoc.com, Jonathan Cameron , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich , Ben Horgan References: <20250910204309.20751-1-james.morse@arm.com> <20250910204309.20751-17-james.morse@arm.com> Content-Language: en-US From: Fenghua Yu In-Reply-To: <20250910204309.20751-17-james.morse@arm.com> Content-Type: text/plain; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/10/25 13:42, James Morse wrote: > Resetting RIS entries from the cpuhp callback is easy as the > callback occurs on the correct CPU. This won't be true for any other > caller that wants to reset or configure an MSC. > > Add a helper that schedules the provided function if necessary. > > Callers should take the cpuhp lock to prevent the cpuhp callbacks from > changing the MSC state. > > Signed-off-by: James Morse > Reviewed-by: Ben Horgan Reviewed-by: Fenghua Yu Thanks. -Fenghua [SNIP]