diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 07ce18ca71e0..ac5c0f9c7a20 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -604,7 +604,7 @@ return_normal:
 		   online_cpus)
 		cpu_relax();
 	if (!time_left)
-		pr_crit("KGDB: Timed out waiting for secondary CPUs.\n");
+		pr_crit("Timed out waiting for secondary CPUs.\n");
 
 	/*
 	 * At this point the primary processor is completely
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index c6d2c0b1565d..60f6bb817f70 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2256,7 +2256,7 @@ static int kdb_cpu(int argc, const char **argv)
 	/*
 	 * Validate cpunum
 	 */
-	if ((cpunum > NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
+	if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
 		return KDB_BADCPUNUM;
 
 	dbg_switch_cpu = cpunum;