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Fri, 23 Oct 2026 14:52:47 +0000 Message-ID: <0f03e149-6050-47c1-9553-1a2904cc7a52@intel.com> Date: Fri, 23 Oct 2026 07:52:45 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 01/10] arm_mpam: resctrl: Use find_component() when allocating a domain To: Jinjie Ruan , , , , CC: , , , , , , References: <94ddff51b91f4a51965baf0384c2368e292c1a8c.1792443633.git.reinette.chatre@intel.com> Content-Language: en-US From: Reinette Chatre In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4PR03CA0276.namprd03.prod.outlook.com (2603:10b6:303:b5::11) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB8370:EE_|EAYPR11MB115281:EE_ X-MS-Office365-Filtering-Correlation-Id: c27c02bf-c20f-4f3f-a12e-08df31154d3c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|23010399003|1800799024|366016|22082099003|18002099003|10067099003|11063799006|56012099006|4143699003|261022105027099003|261022075727099003|261009223027099003|261021121427099003|261021123027099003; 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When the resource supports allocation, that >> component also backs the control domain. The check uses an open-coded >> walk of the class's component list, while the same function uses >> find_component() to find the component backing each monitoring event. >> >> The open-coded walk duplicates find_component(). It also holds the SRCU >> read lock until mpam_resctrl_alloc_domain() returns, which suggests that >> the component needs this protection while the domain is set up. >> >> The component does not need it. Components are freed only when an MSC >> fails to probe, in which case MPAM is never enabled and no resctrl >> domain is created, or by mpam_disable(), which first removes the CPU >> hotplug callbacks and thereby tears down all resctrl domains. A component >> therefore outlives every domain that refers to it. The SRCU read lock is >> only needed while walking the component list, and find_component() holds >> it for that walk. In addition, mpam_resctrl_alloc_domain() only runs >> from MPAM's CPU hotplug startup callback, which already holds the SRCU >> read lock throughout. >> >> Replace the open-coded walk with find_component(). >> >> Signed-off-by: Reinette Chatre >> --- >> drivers/resctrl/mpam_resctrl.c | 13 ++----------- >> 1 file changed, 2 insertions(+), 11 deletions(-) >> >> diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c >> index 9cec5843e8fa..3d5f90f9f1f3 100644 >> --- a/drivers/resctrl/mpam_resctrl.c >> +++ b/drivers/resctrl/mpam_resctrl.c >> @@ -1623,21 +1623,12 @@ mpam_resctrl_alloc_domain(unsigned int cpu, struct mpam_resctrl_res *res) >> struct rdt_l3_mon_domain *mon_d; >> struct rdt_ctrl_domain *ctrl_d; >> struct mpam_class *class = res->class; >> - struct mpam_component *comp_iter, *ctrl_comp; >> + struct mpam_component *ctrl_comp; >> struct rdt_resource *r = &res->resctrl_res; >> >> lockdep_assert_held(&domain_list_lock); >> >> - ctrl_comp = NULL; >> - guard(srcu)(&mpam_srcu); >> - list_for_each_entry_srcu(comp_iter, &class->components, class_list, >> - srcu_read_lock_held(&mpam_srcu)) { >> - if (cpumask_test_cpu(cpu, &comp_iter->affinity)) { >> - ctrl_comp = comp_iter; >> - break; >> - } >> - } > > LGTM > Reviewed-by: Jinjie Ruan > Thank you very much for taking a look at this series. Reinette