perf machine: Use realloc_array_as_needed() in machine__set_current_tid()

Prepare machine__set_current_tid() for use with guest machines that do
not currently have a machine->env->nr_cpus_avail value by making use of
realloc_array_as_needed().

Signed-off-by: Adrian Hunter <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/machine.c

···
 
 pid_t machine__get_current_tid(struct machine *machine, int cpu)
 {
-	int nr_cpus = min(machine->env->nr_cpus_avail, MAX_NR_CPUS);
-
-	if (cpu < 0 || cpu >= nr_cpus || !machine->current_tid)
+	if (cpu < 0 || (size_t)cpu >= machine->current_tid_sz)
 		return -1;
 
 	return machine->current_tid[cpu];
···
 			     pid_t tid)
 {
 	struct thread *thread;
-	int nr_cpus = min(machine->env->nr_cpus_avail, MAX_NR_CPUS);
+	const pid_t init_val = -1;
 
 	if (cpu < 0)
 		return -EINVAL;
 
-	if (!machine->current_tid) {
-		int i;
-
-		machine->current_tid = calloc(nr_cpus, sizeof(pid_t));
-		if (!machine->current_tid)
-			return -ENOMEM;
-		for (i = 0; i < nr_cpus; i++)
-			machine->current_tid[i] = -1;
-	}
-
-	if (cpu >= nr_cpus) {
-		pr_err("Requested CPU %d too large. ", cpu);
-		pr_err("Consider raising MAX_NR_CPUS\n");
-		return -EINVAL;
-	}
+	if (realloc_array_as_needed(machine->current_tid,
+				    machine->current_tid_sz,
+				    (unsigned int)cpu,
+				    &init_val))
+		return -ENOMEM;
 
 	machine->current_tid[cpu] = tid;
 

tools/perf/util/machine.h

···
 	struct map	  *vmlinux_map;
 	u64		  kernel_start;
 	pid_t		  *current_tid;
+	size_t		  current_tid_sz;
 	union { /* Tool specific area */
 		void	  *priv;
 		u64	  db_id;