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Howlett" , , , , Subject: Re: [PATCH 15/79] block: rnull: add `use_per_node_hctx` config option From: "Gary Guo" To: "Alice Ryhl" , "Andreas Hindborg" X-Mailer: aerc 0.21.0 References: <20260216-rnull-v6-19-rc5-send-v1-0-de9a7af4b469@kernel.org> <20260216-rnull-v6-19-rc5-send-v1-15-de9a7af4b469@kernel.org> In-Reply-To: X-ClientProxiedBy: LO4P265CA0151.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2c7::6) To LOVP265MB8871.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:488::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LOVP265MB8871:EE_|LO6P265MB6160:EE_ X-MS-Office365-Filtering-Correlation-Id: 3806b415-46cb-42e3-5534-08de834b629f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|10070799003|376014|7416014|366016|18002099003|56012099003|22082099003; X-Microsoft-Antispam-Message-Info: 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Hindborg > > This and other patches make me think that module parameters should have > value() return a copy of the value (and require Copy). For non-copy > types, there can be a separate value_ref() method. You would avoid *so* > many asterisks by doing that. It's also the sensible thing to do if we're going to add modifiable module_params in the future. Best, Gary > >> +configfs_attribute!(DeviceConfig, 8, >> + show: |this, page| show_field( >> + this.data.lock().submit_queues =3D=3D kernel::num_online_nodes(= ), page >> + ), >> + store: |this, page| store_with_power_check(this, page, |this, page|= { >> + let value =3D core::str::from_utf8(page)? >> + .trim() >> + .parse::() >> + .map_err(|_| kernel::error::code::EINVAL)? >> + !=3D 0; >> + >> + if value { >> + this.data.lock().submit_queues *=3D kernel::num_online_node= s(); >> + } > > kstrtobool again. Also, this is *multiplying* the existing submit_queues > value by the number of NUMA nodes? > >> + use_per_node_hctx: u8 { >> + default: 0, >> + description: >> + "Use per-node allocation for hardware context queues, 0-false, = 1-true. Default: 0-false", >> + }, > > formatting (rustfmt ignores macros) > > Alice