context_tracking: Rename context_tracking_cpu_set() to ct_cpu_track_user()

context_tracking_cpu_set() is called in order to tell a CPU to track
user/kernel transitions. Since context tracking is going to expand in
to also track transitions from/to idle/IRQ/NMIs, the scope
of this function name becomes too broad and needs to be made more
specific. Also shorten the prefix to align with the new namespace.

Signed-off-by: Frederic Weisbecker <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Neeraj Upadhyay <[e-mail]>
Cc: Uladzislau Rezki <[e-mail]>
Cc: Joel Fernandes <[e-mail]>
Cc: Boqun Feng <[e-mail]>
Cc: Nicolas Saenz Julienne <[e-mail]>
Cc: Marcelo Tosatti <[e-mail]>
Cc: Xiongfeng Wang <[e-mail]>
Cc: Yu Liao <[e-mail]>
Cc: Phil Auld <[e-mail]>
Cc: Paul Gortmaker<[e-mail]>
Cc: Alex Belits <[e-mail]>
Signed-off-by: Paul E. McKenney <[e-mail]>
Reviewed-by: Nicolas Saenz Julienne <[e-mail]>
Tested-by: Nicolas Saenz Julienne <[e-mail]>

include/linux/context_tracking.h

···
 
 
 #ifdef CONFIG_CONTEXT_TRACKING
-extern void context_tracking_cpu_set(int cpu);
+extern void ct_cpu_track_user(int cpu);
 
 /* Called with interrupts disabled.  */
 extern void __ct_user_enter(enum ctx_state state);

kernel/context_tracking.c

···
 }
 NOKPROBE_SYMBOL(user_exit_callable);
 
-void __init context_tracking_cpu_set(int cpu)
+void __init ct_cpu_track_user(int cpu)
 {
 	static __initdata bool initialized = false;
 
···
 	int cpu;
 
 	for_each_possible_cpu(cpu)
-		context_tracking_cpu_set(cpu);
+		ct_cpu_track_user(cpu);
 }
 #endif

kernel/time/tick-sched.c

···
 	}
 
 	for_each_cpu(cpu, tick_nohz_full_mask)
-		context_tracking_cpu_set(cpu);
+		ct_cpu_track_user(cpu);
 
 	ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
 					"kernel/nohz:predown", NULL,