powerpc/smp: Do not BUG_ON if invalid CPU during kick

During secondary start, we do not need to BUG_ON if an invalid CPU number
is passed. We already print an error if secondary cannot be started, so
just return an error instead.
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/smp.c

@@ -112,7 +112,8 @@ int smp_generic_cpu_bootable(unsigned int nr)
 #ifdef CONFIG_PPC64
 int smp_generic_kick_cpu(int nr)
 {
-	BUG_ON(nr < 0 || nr >= NR_CPUS);
+	if (nr < 0 || nr >= NR_CPUS)
+		return -EINVAL;
 
 	/*
 	 * The processor is currently spinning, waiting for the

arch/powerpc/platforms/cell/smp.c

@@ -115,7 +115,8 @@ static void smp_cell_setup_cpu(int cpu)
 
 static int smp_cell_kick_cpu(int nr)
 {
-	BUG_ON(nr < 0 || nr >= NR_CPUS);
+	if (nr < 0 || nr >= NR_CPUS)
+		return -EINVAL;
 
 	if (!smp_startup_cpu(nr))
 		return -ENOENT;

arch/powerpc/platforms/powernv/smp.c

@@ -63,7 +63,8 @@ static int pnv_smp_kick_cpu(int nr)
 	long rc;
 	uint8_t status;
 
-	BUG_ON(nr < 0 || nr >= NR_CPUS);
+	if (nr < 0 || nr >= NR_CPUS)
+		return -EINVAL;
 
 	/*
 	 * If we already started or OPAL is not supported, we just

arch/powerpc/platforms/pseries/smp.c

@@ -151,7 +151,8 @@ static void smp_setup_cpu(int cpu)
 
 static int smp_pSeries_kick_cpu(int nr)
 {
-	BUG_ON(nr < 0 || nr >= NR_CPUS);
+	if (nr < 0 || nr >= NR_CPUS)
+		return -EINVAL;
 
 	if (!smp_startup_cpu(nr))
 		return -ENOENT;