Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
Subject: [PATCH v5 11/12] x86/resctrl: Replace smp_call_function_many() with
 on_each_cpu_mask()
From:   Babu Moger <babu.moger@amd.com>
To:     <corbet@lwn.net>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
CC:     <fenghua.yu@intel.com>, <dave.hansen@linux.intel.com>,
        <x86@kernel.org>, <hpa@zytor.com>, <paulmck@kernel.org>,
        <akpm@linux-foundation.org>, <quic_neeraju@quicinc.com>,
        <rdunlap@infradead.org>, <damien.lemoal@opensource.wdc.com>,
        <songmuchun@bytedance.com>, <peterz@infradead.org>,
        <jpoimboe@kernel.org>, <pbonzini@redhat.com>, <babu.moger@amd.com>,
        <chang.seok.bae@intel.com>, <pawan.kumar.gupta@linux.intel.com>,
        <jmattson@google.com>, <daniel.sneddon@linux.intel.com>,
        <sandipan.das@amd.com>, <tony.luck@intel.com>,
        <james.morse@arm.com>, <linux-doc@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <bagasdotme@gmail.com>,
        <eranian@google.com>
Date:   Tue, 27 Sep 2022 15:26:53 -0500
Message-ID: <166431041367.373387.16343892218388937640.stgit@bmoger-ubuntu>
In-Reply-To: <166431016617.373387.1968875281081252467.stgit@bmoger-ubuntu>
References: <166431016617.373387.1968875281081252467.stgit@bmoger-ubuntu>
User-Agent: StGit/1.1.dev103+g5369f4c
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Sep 2022 20:26:56.6354
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: e1b716f3-4348-4f14-cfbd-08daa0c69f91
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT027.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6094
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham
        autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

The call on_each_cpu_mask() can run the function on each CPU specified=0A=
by cpumask, which may include the local processor. So, replace the call=0A=
smp_call_function_man()y with on_each_cpu_mask() to simplify the code.=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |   29 ++++++++--------------------=
-=0A=
 1 file changed, 8 insertions(+), 21 deletions(-)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index 87f3f8018c92..532bb0025054 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -325,12 +325,7 @@ static void update_cpu_closid_rmid(void *info)=0A=
 static void=0A=
 update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r)=0A=
 {=0A=
-	int cpu =3D get_cpu();=0A=
-=0A=
-	if (cpumask_test_cpu(cpu, cpu_mask))=0A=
-		update_cpu_closid_rmid(r);=0A=
-	smp_call_function_many(cpu_mask, update_cpu_closid_rmid, r, 1);=0A=
-	put_cpu();=0A=
+	on_each_cpu_mask(cpu_mask, update_cpu_closid_rmid, r, 1);=0A=
 }=0A=
 =0A=
 static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,=
=0A=
@@ -2121,13 +2116,9 @@ static int set_cache_qos_cfg(int level, bool enable)=
=0A=
 			/* Pick one CPU from each domain instance to update MSR */=0A=
 			cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);=0A=
 	}=0A=
-	cpu =3D get_cpu();=0A=
-	/* Update QOS_CFG MSR on this cpu if it's in cpu_mask. */=0A=
-	if (cpumask_test_cpu(cpu, cpu_mask))=0A=
-		update(&enable);=0A=
-	/* Update QOS_CFG MSR on all other cpus in cpu_mask. */=0A=
-	smp_call_function_many(cpu_mask, update, &enable, 1);=0A=
-	put_cpu();=0A=
+=0A=
+	/* Update QOS_CFG MSR on all the CPUs in cpu_mask */=0A=
+	on_each_cpu_mask(cpu_mask, update, &enable, 1);=0A=
 =0A=
 	free_cpumask_var(cpu_mask);=0A=
 =0A=
@@ -2569,7 +2560,7 @@ static int reset_all_ctrls(struct rdt_resource *r)=0A=
 	struct msr_param msr_param;=0A=
 	cpumask_var_t cpu_mask;=0A=
 	struct rdt_domain *d;=0A=
-	int i, cpu;=0A=
+	int i;=0A=
 =0A=
 	if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))=0A=
 		return -ENOMEM;=0A=
@@ -2590,13 +2581,9 @@ static int reset_all_ctrls(struct rdt_resource *r)=
=0A=
 		for (i =3D 0; i < hw_res->num_closid; i++)=0A=
 			hw_dom->ctrl_val[i] =3D r->default_ctrl;=0A=
 	}=0A=
-	cpu =3D get_cpu();=0A=
-	/* Update CBM on this cpu if it's in cpu_mask. */=0A=
-	if (cpumask_test_cpu(cpu, cpu_mask))=0A=
-		rdt_ctrl_update(&msr_param);=0A=
-	/* Update CBM on all other cpus in cpu_mask. */=0A=
-	smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);=0A=
-	put_cpu();=0A=
+=0A=
+	/* Update CBM on all the CPUs in cpu_mask */=0A=
+	on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);=0A=
 =0A=
 	free_cpumask_var(cpu_mask);=0A=
 =0A=
=0A=