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Subject: [PATCH v6 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>,
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        <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>,
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        <eranian@google.com>
Date:   Mon, 10 Oct 2022 15:30:33 -0500
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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_many() 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 e744db5dc057..4f8a1c9c3e7a 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=
@@ -2131,13 +2126,9 @@ 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=
@@ -2614,7 +2605,7 @@ 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=
@@ -2635,13 +2626,9 @@ 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=