livepatch: Replace deprecated CPU-hotplug functions.

The functions get_online_cpus() and put_online_cpus() have been
deprecated during the CPU hotplug rework. They map directly to
cpus_read_lock() and cpus_read_unlock().

Replace deprecated CPU-hotplug functions with the official version.
The behavior remains unchanged.

Cc: Josh Poimboeuf <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Miroslav Benes <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Joe Lawrence <[email protected]>
Cc: [email protected]
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Sebastian Andrzej Siewior

kernel/livepatch/transition.c

@@ -411,7 +411,7 @@ void klp_try_complete_transition(void)
 	/*
 	 * Ditto for the idle "swapper" tasks.
 	 */
-	get_online_cpus();
+	cpus_read_lock();
 	for_each_possible_cpu(cpu) {
 		task = idle_task(cpu);
 		if (cpu_online(cpu)) {
@@ -423,7 +423,7 @@ void klp_try_complete_transition(void)
 			task->patch_state = klp_target_state;
 		}
 	}
-	put_online_cpus();
+	cpus_read_unlock();
 
 	if (!complete) {
 		if (klp_signals_cnt && !(klp_signals_cnt % SIGNALS_TIMEOUT))