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Tue, 27 Jan 2026 08:02:06 -0800 Date: Tue, 27 Jan 2026 08:02:04 -0800 From: Nicolin Chen To: Will Deacon CC: , , , , , , , , , , , Subject: Re: [PATCH v10 0/8] iommu/arm-smmu-v3: Introduce an RCU-protected invalidation array Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000066EA:EE_|DM4PR12MB6350:EE_ X-MS-Office365-Filtering-Correlation-Id: a3cad237-971f-482c-305e-08de5dbd7808 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|36860700013|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Q54iyhvxzaUz9JOWEHEdEBBOW73caFXvpC8B2a+kRcD1AsxsHThXjy72yncK?= =?us-ascii?Q?njZRJgchflSvCcrP+Ox9bwqUL/g3vSY3szVT6KFcdckkjlTNJX6Amrfqv59m?= =?us-ascii?Q?SeuGRz+I3GQ9b0LTfIB/SDIaEbsdPnAh8rZjTQrYbwo6HS+9Y0eoZ4qO6oO2?= =?us-ascii?Q?kYUdBVP/iMhOSfr20J9TYltNUC/pdjdRETk/P6Fdi/t9hSB1tmzF5nqf8mFy?= =?us-ascii?Q?ZkEzVVdpX9WAXzvkIkD5T/jYpiy4xXwq1PuiSD8be3Ra/vMPFtWZ5d3RUcig?= =?us-ascii?Q?0QMpVErnsG2FvNgWfHvJRZ5sGG5NHQcBXnz6sGlNlwIV/S7p7kvOV6AkCMzv?= =?us-ascii?Q?NPJ+9oBWGRw700XORrZUbt/adcSc1wCMmubw+rL9+9yftzE0UABOJ9qQ+W+v?= =?us-ascii?Q?jpI5BiUOCe7KqzBydJHgZOnqdBOeB5xBlADCB9bytv52+Q61I5F2Sb7SYamk?= =?us-ascii?Q?h8wbL8zU5L9fc9N7uBU5q/6UQc5b1TGmI5FWZYH+UjnhgFdP8sAniM6zRI57?= =?us-ascii?Q?QsFN50hoN/WnS3dW0CX9g2R0n9GFk3n7OGhX7n1cuzuSTjspPoDmbHvSqO5c?= =?us-ascii?Q?Q/ef0aDQqBrLonZwtx2y8eBadcyCgzQ4e0Tx5Rz6APMaF/jcMwRIxX4reKcb?= =?us-ascii?Q?tRFYncHIZ0+zSznamIAa5Mzvh3BM08F6P6bdbfSpAYbw9xaW30jCIi44eiNU?= =?us-ascii?Q?AChqnibPWaXDM6rJAZ+T0rPY0aCvnF+/jBfeQsb9m55+VlOyoPNNfVJcyFeN?= =?us-ascii?Q?oxfL+8fEBLjmNyQx7g8bReYqm/st1UNB+biQEIzh6XfwzKayD8IeBzjJngNL?= =?us-ascii?Q?AdpeUvzReQfGtxNtrYVx35zCmMalFe8U4wGq3AN0r8TCAVagj0WiLj5I+Pwq?= =?us-ascii?Q?UGYlD/EfcPfY62FLDEFpd9653GIG5neKHFr7Tc4gRuITWrYaR40vUZE0Ftzq?= =?us-ascii?Q?GUzF3yM42BEsyrxNgSWCWFp34r4ONFaa9R0f2kaWWOKM3aEggPNmP2HOo3jZ?= =?us-ascii?Q?K8UlsBy4S2q3EVYMQ4Ce7ds+mJc0oVYC0/chvWv834NDwDGnfcUo9cBqCK7r?= =?us-ascii?Q?jVjoYzEknQjb7OKz5DfOP4hsmNCk6tlzVDNMnrg40sPctIHfTvzRg2yCCsPT?= =?us-ascii?Q?aDNQ1E2DeaH0dqzv9dYytbW9DiZQWTtQBoqN1BCj/DoFKKHhQbSADaTUWK65?= =?us-ascii?Q?eOAqj5c1oQbKKJxO2RjWSojDAwqq/QNLTh6887Zt+XSLnqLbUdaiV0sm+epc?= =?us-ascii?Q?rPg8z8k0AmmMvl8WcDLmx75JsREd1P7sMmnHQqbgpUMBvx2Q8kPHCeY8v7It?= =?us-ascii?Q?wGVGyaNC4qQxKLRl40YGsg+MxyefLV+w2fY1dSUelgnyXv/R4E+aw9VDqExR?= =?us-ascii?Q?zRQ9xo6gSslp6B6ZShU1LJ42XzN8vOOSCrIi0xMwWXDpIR2AjDW+6vrymtnH?= =?us-ascii?Q?yakrSlTu8cKpkD2rWHgHl14G8jAaxjEE2B1Y0cOuEoCzuNAeJYF+n94SrVL0?= =?us-ascii?Q?AGgUs/mrZif7JTwGNWo21XO2B3S3fI2fmXo0nFX3Zj5iJiCiR6zkd4jXPRXK?= =?us-ascii?Q?jCqDwsiw92oLydCDRv0bJ2JrUdMAbS1mMgQZvgo3GG7ho9HpDaj7oGzRwRV0?= =?us-ascii?Q?TZIjly2CzsfEwnt4OEu6X52UZJ/YhoR4xqKpqFyje/sG21IDqdUgRkqxNWq7?= =?us-ascii?Q?mkFnNw=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(376014)(36860700013)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jan 2026 16:02:27.6266 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a3cad237-971f-482c-305e-08de5dbd7808 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000066EA.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6350 On Tue, Jan 27, 2026 at 01:37:46PM +0000, Will Deacon wrote: > On Mon, Jan 26, 2026 at 07:09:11PM -0800, Nicolin Chen wrote: > > Changelog > > v10: > > * Rebase on arm/smmu/updates > > * Add Reviewed-by from Pranjal > > * Fix typo in kdoc and update comments > > * Add dma_wmb() in arm_smmu_write_entry() > > * Drop free_fn from arm_smmu_invs_unref() > > * Replace refcount_t users with WRITE_ONCE/READ_ONCE() > > * Verify num_trashes in arm_smmu_v3_invs_test_verify() > > I think it probably just slipped through the cracks, but Pranjal had a > concern in v9 about the rwlock not being irqsafe: > > https://lore.kernel.org/r/aXND9YJTwm6om689@google.com > > Did that get discussed someplace that I missed? My bad. I missed it. I'll reply there. Nicolin