driver core: cpu: don't hand-override the uevent bus_type callback.

Instead of having to change the uevent bus_type callback by hand at
runtime, set it at build time based on the build configuration options,
making this much simpler to maintain and understand (and allow to make
the structure constant.)

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230210102408.1083177-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: gregkh

drivers/base/cpu.c

@@ -125,17 +125,6 @@ static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
 #endif /* CONFIG_HOTPLUG_CPU */
 
-struct bus_type cpu_subsys = {
-	.name = "cpu",
-	.dev_name = "cpu",
-	.match = cpu_subsys_match,
-#ifdef CONFIG_HOTPLUG_CPU
-	.online = cpu_subsys_online,
-	.offline = cpu_subsys_offline,
-#endif
-};
-EXPORT_SYMBOL_GPL(cpu_subsys);
-
 #ifdef CONFIG_KEXEC
 #include <linux/kexec.h>
 
@@ -348,6 +337,20 @@ static int cpu_uevent(const struct device *dev, struct kobj_uevent_env *env)
 }
 #endif
 
+struct bus_type cpu_subsys = {
+	.name = "cpu",
+	.dev_name = "cpu",
+	.match = cpu_subsys_match,
+#ifdef CONFIG_HOTPLUG_CPU
+	.online = cpu_subsys_online,
+	.offline = cpu_subsys_offline,
+#endif
+#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
+	.uevent = cpu_uevent,
+#endif
+};
+EXPORT_SYMBOL_GPL(cpu_subsys);
+
 /*
  * register_cpu - Setup a sysfs device for a CPU.
  * @cpu - cpu->hotpluggable field set to 1 will generate a control file in
@@ -368,9 +371,6 @@ int register_cpu(struct cpu *cpu, int num)
 	cpu->dev.offline_disabled = !cpu->hotpluggable;
 	cpu->dev.offline = !cpu_online(num);
 	cpu->dev.of_node = of_get_cpu_node(num, NULL);
-#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
-	cpu->dev.bus->uevent = cpu_uevent;
-#endif
 	cpu->dev.groups = common_cpu_attr_groups;
 	if (cpu->hotpluggable)
 		cpu->dev.groups = hotplugable_cpu_attr_groups;