cpufreq: ACPI: Use on_each_cpu_mask() in drv_write()

Make drv_write() call on_each_cpu_mask() instead of using an open-coded
equivalent of the latter.

Also remove a comment mentioning the smp_call_function_many() usage
which is not particularly useful anyway.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>

Author: rafaeljw

drivers/cpufreq/acpi-cpufreq.c

@@ -318,7 +318,6 @@ static u32 drv_read(struct acpi_cpufreq_data *data, const struct cpumask *mask)
 	return cmd.val;
 }
 
-/* Called via smp_call_function_many(), on the target CPUs */
 static void do_drv_write(void *_cmd)
 {
 	struct drv_cmd *cmd = _cmd;
@@ -335,14 +334,8 @@ static void drv_write(struct acpi_cpufreq_data *data,
 		.val = val,
 		.func.write = data->cpu_freq_write,
 	};
-	int this_cpu;
 
-	this_cpu = get_cpu();
-	if (cpumask_test_cpu(this_cpu, mask))
-		do_drv_write(&cmd);
-
-	smp_call_function_many(mask, do_drv_write, &cmd, 1);
-	put_cpu();
+	on_each_cpu_mask(mask, do_drv_write, &cmd, true);
 }
 
 static u32 get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data)