diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index 72d5c198e790..3efe117721aa 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -37,7 +37,7 @@ config DEBUG_STACK_USAGE
 
 	  This option will slow down process creation somewhat.
 
-config CONFIG_SMTC_IDLE_HOOK_DEBUG
+config SMTC_IDLE_HOOK_DEBUG
 	bool "Enable additional debug checks before going into CPU idle loop"
 	depends on DEBUG_KERNEL && MIPS_MT_SMTC
 	help
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 0fc90ba16ae1..b12eeee0e974 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -137,13 +137,24 @@ static inline void check_wait(void)
 	case CPU_4KEC:
 	case CPU_4KSC:
 	case CPU_5KC:
-	case CPU_24K:
 	case CPU_25KF:
-	case CPU_34K:
-	case CPU_74K:
- 	case CPU_PR4450:
+	case CPU_PR4450:
 		cpu_wait = r4k_wait;
 		break;
+
+	case CPU_24K:
+	case CPU_34K:
+		cpu_wait = r4k_wait;
+		if (read_c0_config7() & MIPS_CONF7_WII)
+			cpu_wait = r4k_wait_irqoff;
+		break;
+
+	case CPU_74K:
+		cpu_wait = r4k_wait;
+		if ((c->processor_id & 0xff) >= PRID_REV_ENCODE_332(2, 1, 0))
+			cpu_wait = r4k_wait_irqoff;
+		break;
+
 	case CPU_TX49XX:
 		cpu_wait = r4k_wait_irqoff;
 		break;
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index b1233644fcca..3ea7863c4519 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1372,12 +1372,12 @@ void __init per_cpu_trap_init(void)
 	 */
 	if (cpu_has_mips_r2) {
 		cp0_compare_irq = (read_c0_intctl () >> 29) & 7;
-		cp0_perfcount_irq = -1;
+		cp0_perfcount_irq = (read_c0_intctl () >> 26) & 7;
+		if (cp0_perfcount_irq == cp0_compare_irq)
+			cp0_perfcount_irq = -1;
 	} else {
 		cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ;
-		cp0_perfcount_irq = (read_c0_intctl () >> 26) & 7;
-		if (cp0_perfcount_irq != cp0_compare_irq)
-			cp0_perfcount_irq = -1;
+		cp0_perfcount_irq = -1;
 	}
 
 #ifdef CONFIG_MIPS_MT_SMTC
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index c9ee9d2d5856..9e66354dee8b 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -1436,10 +1436,6 @@ static int __init vpe_module_init(void)
 			write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
 
 			if (i != 0) {
-				write_vpe_c0_status((read_c0_status() &
-						     ~(ST0_IM | ST0_IE | ST0_KSU))
-						    | ST0_CU0);
-
 				/*
 				 * Set config to be the same as vpe0,
 				 * particularly kseg0 coherency alg
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 5dad13efba7e..1c1aa9f92f6c 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -9,4 +9,4 @@ obj-y			+= iomap.o
 obj-$(CONFIG_PCI)	+= iomap-pci.o
 
 # libgcc-style stuff needed in the kernel
-lib-y += ashldi3.o ashrdi3.o lshrdi3.o ucmpdi2.o
+obj-y += ashldi3.o ashrdi3.o lshrdi3.o ucmpdi2.o
diff --git a/include/asm-mips/addrspace.h b/include/asm-mips/addrspace.h
index c6275088cf65..964c5eddc21b 100644
--- a/include/asm-mips/addrspace.h
+++ b/include/asm-mips/addrspace.h
@@ -133,6 +133,7 @@
     || defined (CONFIG_CPU_R4X00)					\
     || defined (CONFIG_CPU_R5000)					\
     || defined (CONFIG_CPU_RM7000)					\
+    || defined (CONFIG_CPU_RM9000)					\
     || defined (CONFIG_CPU_NEVADA)					\
     || defined (CONFIG_CPU_TX49XX)					\
     || defined (CONFIG_CPU_MIPS64)
diff --git a/include/asm-mips/cpu.h b/include/asm-mips/cpu.h
index d38fdbf845b2..2924069075e0 100644
--- a/include/asm-mips/cpu.h
+++ b/include/asm-mips/cpu.h
@@ -124,6 +124,17 @@
 #define PRID_REV_VR4181A	0x0070	/* Same as VR4122 */
 #define PRID_REV_VR4130		0x0080
 
+/*
+ * Older processors used to encode processor version and revision in two
+ * 4-bit bitfields, the 4K seems to simply count up and even newer MTI cores
+ * have switched to use the 8-bits as 3:3:2 bitfield with the last field as
+ * the patch number.  *ARGH*
+ */
+#define PRID_REV_ENCODE_44(ver, rev)					\
+	((ver) << 4 | (rev))
+#define PRID_REV_ENCODE_332(ver, rev, patch)				\
+	((ver) << 5 | (rev) << 2 | (patch))
+
 /*
  * FPU implementation/revision register (CP1 control register 0).
  *
diff --git a/include/asm-mips/mipsregs.h b/include/asm-mips/mipsregs.h
index 9985cb7c16e7..89c81922d47c 100644
--- a/include/asm-mips/mipsregs.h
+++ b/include/asm-mips/mipsregs.h
@@ -534,6 +534,8 @@
 #define MIPS_CONF3_LPA		(_ULCAST_(1) <<  7)
 #define MIPS_CONF3_DSP		(_ULCAST_(1) << 10)
 
+#define MIPS_CONF7_WII		(_ULCAST_(1) << 31)
+
 /*
  * Bits in the MIPS32/64 coprocessor 1 (FPU) revision register.
  */
diff --git a/include/asm-mips/war.h b/include/asm-mips/war.h
index 13a3502eef44..ec0eeebd8802 100644
--- a/include/asm-mips/war.h
+++ b/include/asm-mips/war.h
@@ -177,18 +177,22 @@
 #endif
 
 /*
- * The RM9000 has a bug (though PMC-Sierra opposes it being called that)
- * where invalid instructions in the same I-cache line worth of instructions
- * being fetched may case spurious exceptions.
+ * The RM7000 processors and the E9000 cores have a bug (though PMC-Sierra
+ * opposes it being called that) where invalid instructions in the same
+ * I-cache line worth of instructions being fetched may case spurious
+ * exceptions.
  */
-#if defined(CONFIG_MOMENCO_JAGUAR_ATX) || defined(CONFIG_MOMENCO_OCELOT_3) || \
-    defined(CONFIG_PMC_YOSEMITE) || defined(CONFIG_BASLER_EXCITE)
+#if defined(CONFIG_BASLER_EXCITE) || defined(CONFIG_MOMENCO_JAGUAR_ATX) || \
+    defined(CONFIG_MIPS_ATLAS) || defined(CONFIG_MIPS_MALTA) || \
+    defined(CONFIG_MOMENCO_OCELOT) || defined(CONFIG_MOMENCO_OCELOT_3) || \
+    defined(CONFIG_MOMENCO_OCELOT_C) || defined(CONFIG_PMC_YOSEMITE) || \
+    defined(CONFIG_SGI_IP32) || defined(CONFIG_WR_PPMC)
 #define ICACHE_REFILLS_WORKAROUND_WAR	1
 #endif
 
 
 /*
- * ON the R10000 upto version 2.6 (not sure about 2.7) there is a bug that
+ * On the R10000 upto version 2.6 (not sure about 2.7) there is a bug that
  * may cause ll / sc and lld / scd sequences to execute non-atomically.
  */
 #ifdef CONFIG_SGI_IP27