diff --git a/arch/mips/cavium-octeon/octeon-usb.c b/arch/mips/cavium-octeon/octeon-usb.c
index 1f730ded5224..cc88a08bc1f7 100644
--- a/arch/mips/cavium-octeon/octeon-usb.c
+++ b/arch/mips/cavium-octeon/octeon-usb.c
@@ -398,6 +398,7 @@ static int dwc3_octeon_clocks_start(struct device *dev, u64 base)
 	default:
 		dev_err(dev, "Invalid ref_clk %u, using 100000000 instead\n",
 			clock_rate);
+		/* fall through */
 	case 100000000:
 		mpll_mul = 0x19;
 		if (ref_clk_sel < 2)
diff --git a/arch/mips/kernel/cacheinfo.c b/arch/mips/kernel/cacheinfo.c
index e0dd66881da6..f777e44653d5 100644
--- a/arch/mips/kernel/cacheinfo.c
+++ b/arch/mips/kernel/cacheinfo.c
@@ -69,6 +69,8 @@ static int __populate_cache_leaves(unsigned int cpu)
 	if (c->tcache.waysize)
 		populate_cache(tcache, this_leaf, 3, CACHE_TYPE_UNIFIED);
 
+	this_cpu_ci->cpu_map_populated = true;
+
 	return 0;
 }
 
diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index 5f209f111e59..df7ddd246eaa 100644
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -32,7 +32,8 @@ void __init setup_pit_timer(void)
 
 static int __init init_pit_clocksource(void)
 {
-	if (num_possible_cpus() > 1) /* PIT does not scale! */
+	if (num_possible_cpus() > 1 || /* PIT does not scale! */
+	    !clockevent_state_periodic(&i8253_clockevent))
 		return 0;
 
 	return clocksource_i8253_init();
diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
index e5de6bac8197..754094b40a75 100644
--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c
@@ -140,6 +140,7 @@ static int kvm_compute_return_epc(struct kvm_vcpu *vcpu, unsigned long instpc,
 		/* These are unconditional and in j_format. */
 	case jal_op:
 		arch->gprs[31] = instpc + 8;
+		/* fall through */
 	case j_op:
 		epc += 4;
 		epc >>= 28;
diff --git a/arch/mips/oprofile/op_model_mipsxx.c b/arch/mips/oprofile/op_model_mipsxx.c
index 7c04b17f4a48..96c13a0ab078 100644
--- a/arch/mips/oprofile/op_model_mipsxx.c
+++ b/arch/mips/oprofile/op_model_mipsxx.c
@@ -172,12 +172,15 @@ static void mipsxx_cpu_setup(void *args)
 	case 4:
 		w_c0_perfctrl3(0);
 		w_c0_perfcntr3(reg.counter[3]);
+		/* fall through */
 	case 3:
 		w_c0_perfctrl2(0);
 		w_c0_perfcntr2(reg.counter[2]);
+		/* fall through */
 	case 2:
 		w_c0_perfctrl1(0);
 		w_c0_perfcntr1(reg.counter[1]);
+		/* fall through */
 	case 1:
 		w_c0_perfctrl0(0);
 		w_c0_perfcntr0(reg.counter[0]);
@@ -195,10 +198,13 @@ static void mipsxx_cpu_start(void *args)
 	switch (counters) {
 	case 4:
 		w_c0_perfctrl3(WHAT | reg.control[3]);
+		/* fall through */
 	case 3:
 		w_c0_perfctrl2(WHAT | reg.control[2]);
+		/* fall through */
 	case 2:
 		w_c0_perfctrl1(WHAT | reg.control[1]);
+		/* fall through */
 	case 1:
 		w_c0_perfctrl0(WHAT | reg.control[0]);
 	}
@@ -215,10 +221,13 @@ static void mipsxx_cpu_stop(void *args)
 	switch (counters) {
 	case 4:
 		w_c0_perfctrl3(0);
+		/* fall through */
 	case 3:
 		w_c0_perfctrl2(0);
+		/* fall through */
 	case 2:
 		w_c0_perfctrl1(0);
+		/* fall through */
 	case 1:
 		w_c0_perfctrl0(0);
 	}
@@ -236,6 +245,7 @@ static int mipsxx_perfcount_handler(void)
 
 	switch (counters) {
 #define HANDLE_COUNTER(n)						\
+	/* fall through */						\
 	case n + 1:							\
 		control = r_c0_perfctrl ## n();				\
 		counter = r_c0_perfcntr ## n();				\
@@ -297,12 +307,15 @@ static void reset_counters(void *arg)
 	case 4:
 		w_c0_perfctrl3(0);
 		w_c0_perfcntr3(0);
+		/* fall through */
 	case 3:
 		w_c0_perfctrl2(0);
 		w_c0_perfcntr2(0);
+		/* fall through */
 	case 2:
 		w_c0_perfctrl1(0);
 		w_c0_perfcntr1(0);
+		/* fall through */
 	case 1:
 		w_c0_perfctrl0(0);
 		w_c0_perfcntr0(0);
diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
index d02eb9d16b55..925c72348fb6 100644
--- a/arch/mips/pci/ops-bcm63xx.c
+++ b/arch/mips/pci/ops-bcm63xx.c
@@ -474,6 +474,7 @@ static int bcm63xx_pcie_can_access(struct pci_bus *bus, int devfn)
 		if (PCI_SLOT(devfn) == 0)
 			return bcm_pcie_readl(PCIE_DLSTATUS_REG)
 					& DLSTATUS_PHYLINKUP;
+		/* else, fall through */
 	default:
 		return false;
 	}