ACPI: battery: Rename extensions to hook in messages

This functionality is called "hook" everywhere in the code.
For consistency call it the same in the log messages.

The power supply subsystem is about to get its own extension
functionality. While the two are closely related and will be used
together, the current wording leaves room for misinterpretation.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://patch.msgid.link/20241205-power-supply-extensions-v5-1-f0f996db4347@weissschuh.net
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: t-8ch

drivers/acpi/battery.c

@@ -717,7 +717,7 @@ static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
 	}
 	list_del_init(&hook->list);
 
-	pr_info("extension unregistered: %s\n", hook->name);
+	pr_info("hook unregistered: %s\n", hook->name);
 }
 
 void battery_hook_unregister(struct acpi_battery_hook *hook)
@@ -751,18 +751,18 @@ void battery_hook_register(struct acpi_battery_hook *hook)
 		if (hook->add_battery(battery->bat, hook)) {
 			/*
 			 * If a add-battery returns non-zero,
-			 * the registration of the extension has failed,
+			 * the registration of the hook has failed,
 			 * and we will not add it to the list of loaded
 			 * hooks.
 			 */
-			pr_err("extension failed to load: %s", hook->name);
+			pr_err("hook failed to load: %s", hook->name);
 			battery_hook_unregister_unlocked(hook);
 			goto end;
 		}
 
 		power_supply_changed(battery->bat);
 	}
-	pr_info("new extension: %s\n", hook->name);
+	pr_info("new hook: %s\n", hook->name);
 end:
 	mutex_unlock(&hook_mutex);
 }
@@ -805,10 +805,10 @@ static void battery_hook_add_battery(struct acpi_battery *battery)
 	list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
 		if (hook_node->add_battery(battery->bat, hook_node)) {
 			/*
-			 * The notification of the extensions has failed, to
-			 * prevent further errors we will unload the extension.
+			 * The notification of the hook has failed, to
+			 * prevent further errors we will unload the hook.
 			 */
-			pr_err("error in extension, unloading: %s",
+			pr_err("error in hook, unloading: %s",
 					hook_node->name);
 			battery_hook_unregister_unlocked(hook_node);
 		}