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SJ2PR11MB8370.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2026 14:52:47.0589 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: glZ84or5GZzg3pHHYWbVNkGAqp6WJTBTr4dawW4ZtsM9oMNoU+RJxLBLMV84jAZhJViMWjYLTnxWF4wsX3E4NP33p7zzyC81w5B4TUEgeiw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: EAYPR11MB115281 X-OriginatorOrg: intel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261023_155356_960588_FD52F1C2 X-CRM114-Status: GOOD ( 18.10 ) X-Spam-Score: -2.8 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-17.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/23/26 1:07 AM, Jinjie Ruan wrote: > > > 在 2026/10/20 6:07, Reinette Chatre 写道: >> mpam_resctrl_alloc_domain() starts by checking that the resource's >> class has a component whose CPU affinity includes the CPU, and fails the >> domain allocation otherwise. 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