diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 21eb599..2e01147 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -13,9 +13,9 @@
 #include <asm/system.h>
 #include <asm/hardirq.h>
 #include <asm/hazards.h>
+#include <asm/irq.h>
 #include <asm/mmu_context.h>
 #include <asm/smp.h>
-#include <asm/mips-boards/maltaint.h>
 #include <asm/mipsregs.h>
 #include <asm/cacheflush.h>
 #include <asm/time.h>
@@ -614,7 +614,7 @@
 #ifdef CONFIG_SMTC_IDLE_HOOK_DEBUG
 	unsigned int vpe = current_cpu_data.vpe_id;
 
-	vpemask[vpe][irq - MIPSCPU_INT_BASE] = 1;
+	vpemask[vpe][irq - MIPS_CPU_IRQ_BASE] = 1;
 #endif
 	irq_hwmask[irq] = hwmask;
 
@@ -822,7 +822,7 @@
 	switch (type_copy) {
 	case SMTC_CLOCK_TICK:
 		irq_enter();
-		kstat_this_cpu.irqs[MIPSCPU_INT_BASE + MIPSCPU_INT_CPUCTR]++;
+		kstat_this_cpu.irqs[MIPS_CPU_IRQ_BASE + cp0_perfcount_irq]++;
 		/* Invoke Clock "Interrupt" */
 		ipi_timer_latch[dest_copy] = 0;
 #ifdef CONFIG_SMTC_IDLE_HOOK_DEBUG
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 7def1ff..d48d1d5 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -200,10 +200,15 @@
 EXPORT_SYMBOL(perf_irq);
 
 /*
+ * Timer interrupt
+ */
+int cp0_compare_irq;
+
+/*
  * Performance counter IRQ or -1 if shared with timer
  */
-int mipsxx_perfcount_irq;
-EXPORT_SYMBOL(mipsxx_perfcount_irq);
+int cp0_perfcount_irq;
+EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
 
 /*
  * Possibly handle a performance counter interrupt.
@@ -213,12 +218,12 @@
 {
 	/*
 	 * The performance counter overflow interrupt may be shared with the
-	 * timer interrupt (mipsxx_perfcount_irq < 0). If it is and a
+	 * timer interrupt (cp0_perfcount_irq < 0). If it is and a
 	 * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
 	 * and we can't reliably determine if a counter interrupt has also
 	 * happened (!r2) then don't check for a timer interrupt.
 	 */
-	return (mipsxx_perfcount_irq < 0) &&
+	return (cp0_perfcount_irq < 0) &&
 		perf_irq() == IRQ_HANDLED &&
 		!r2;
 }
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index a7a17eb..b123364 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1350,9 +1350,6 @@
 	if (!secondaryTC) {
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-	/*
-	 * Interrupt handling.
-	 */
 	if (cpu_has_veic || cpu_has_vint) {
 		write_c0_ebase (ebase);
 		/* Setting vector spacing enables EI/VI mode  */
@@ -1366,6 +1363,23 @@
 		} else
 			set_c0_cause(CAUSEF_IV);
 	}
+
+	/*
+	 * Before R2 both interrupt numbers were fixed to 7, so on R2 only:
+	 *
+	 *  o read IntCtl.IPTI to determine the timer interrupt
+	 *  o read IntCtl.IPPCI to determine the performance counter interrupt
+	 */
+	if (cpu_has_mips_r2) {
+		cp0_compare_irq = (read_c0_intctl () >> 29) & 7;
+		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;
+	}
+
 #ifdef CONFIG_MIPS_MT_SMTC
 	}
 #endif /* CONFIG_MIPS_MT_SMTC */
diff --git a/arch/mips/mips-boards/atlas/atlas_int.c b/arch/mips/mips-boards/atlas/atlas_int.c
index 9f49da9..6c8f025 100644
--- a/arch/mips/mips-boards/atlas/atlas_int.c
+++ b/arch/mips/mips-boards/atlas/atlas_int.c
@@ -189,7 +189,7 @@
 	if (irq == MIPSCPU_INT_ATLAS)
 		atlas_hw0_irqdispatch();
 	else if (irq >= 0)
-		do_IRQ(MIPSCPU_INT_BASE + irq);
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 	else
 		spurious_interrupt();
 }
@@ -261,11 +261,11 @@
 	} else if (cpu_has_vint) {
 		set_vi_handler (MIPSCPU_INT_ATLAS, atlas_hw0_irqdispatch);
 #ifdef CONFIG_MIPS_MT_SMTC
-		setup_irq_smtc (MIPSCPU_INT_BASE + MIPSCPU_INT_ATLAS,
+		setup_irq_smtc (MIPS_CPU_IRQ_BASE + MIPSCPU_INT_ATLAS,
 				&atlasirq, (0x100 << MIPSCPU_INT_ATLAS));
 #else /* Not SMTC */
-		setup_irq(MIPSCPU_INT_BASE + MIPSCPU_INT_ATLAS, &atlasirq);
+		setup_irq(MIPS_CPU_IRQ_BASE + MIPSCPU_INT_ATLAS, &atlasirq);
 #endif /* CONFIG_MIPS_MT_SMTC */
 	} else
-		setup_irq(MIPSCPU_INT_BASE + MIPSCPU_INT_ATLAS, &atlasirq);
+		setup_irq(MIPS_CPU_IRQ_BASE + MIPSCPU_INT_ATLAS, &atlasirq);
 }
diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c
index 8f1000f..c45d556 100644
--- a/arch/mips/mips-boards/generic/time.c
+++ b/arch/mips/mips-boards/generic/time.c
@@ -54,7 +54,7 @@
 unsigned long cpu_khz;
 
 static int mips_cpu_timer_irq;
-extern int mipsxx_perfcount_irq;
+extern int cp0_perfcount_irq;
 extern void smtc_timer_broadcast(int);
 
 static void mips_timer_dispatch(void)
@@ -64,7 +64,7 @@
 
 static void mips_perf_dispatch(void)
 {
-	do_IRQ(mipsxx_perfcount_irq);
+	do_IRQ(cp0_perfcount_irq);
 }
 
 /*
@@ -82,12 +82,12 @@
 {
 	/*
 	 * The performance counter overflow interrupt may be shared with the
-	 * timer interrupt (mipsxx_perfcount_irq < 0). If it is and a
+	 * timer interrupt (cp0_perfcount_irq < 0). If it is and a
 	 * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
 	 * and we can't reliably determine if a counter interrupt has also
 	 * happened (!r2) then don't check for a timer interrupt.
 	 */
-	return (mipsxx_perfcount_irq < 0) &&
+	return (cp0_perfcount_irq < 0) &&
 		perf_irq() == IRQ_HANDLED &&
 		!r2;
 }
@@ -259,42 +259,31 @@
 
 void __init plat_perf_setup(struct irqaction *irq)
 {
-	int hwint = 0;
-	mipsxx_perfcount_irq = -1;
+	cp0_perfcount_irq = -1;
 
 #ifdef MSC01E_INT_BASE
 	if (cpu_has_veic) {
 		set_vi_handler (MSC01E_INT_PERFCTR, mips_perf_dispatch);
-		mipsxx_perfcount_irq = MSC01E_INT_BASE + MSC01E_INT_PERFCTR;
+		cp0_perfcount_irq = MSC01E_INT_BASE + MSC01E_INT_PERFCTR;
 	} else
 #endif
-	if (cpu_has_mips_r2) {
-		/*
-		 * Read IntCtl.IPPCI to determine the performance
-		 * counter interrupt
-		 */
-		hwint = (read_c0_intctl () >> 26) & 7;
-		if (hwint != MIPSCPU_INT_CPUCTR) {
-			if (cpu_has_vint)
-				set_vi_handler (hwint, mips_perf_dispatch);
-			mipsxx_perfcount_irq = MIPSCPU_INT_BASE + hwint;
-		}
-	}
-	if (mipsxx_perfcount_irq >= 0) {
+	if (cp0_perfcount_irq >= 0) {
+		if (cpu_has_vint)
+			set_vi_handler(cp0_perfcount_irq, mips_perf_dispatch);
 #ifdef CONFIG_MIPS_MT_SMTC
-		setup_irq_smtc(mipsxx_perfcount_irq, irq, 0x100 << hwint);
+		setup_irq_smtc(cp0_perfcount_irq, irq,
+		               0x100 << cp0_perfcount_irq);
 #else
-		setup_irq(mipsxx_perfcount_irq, irq);
+		setup_irq(cp0_perfcount_irq, irq);
 #endif /* CONFIG_MIPS_MT_SMTC */
 #ifdef CONFIG_SMP
-		set_irq_handler(mipsxx_perfcount_irq, handle_percpu_irq);
+		set_irq_handler(cp0_perfcount_irq, handle_percpu_irq);
 #endif
 	}
 }
 
 void __init plat_timer_setup(struct irqaction *irq)
 {
-	int hwint = 0;
 #ifdef MSC01E_INT_BASE
 	if (cpu_has_veic) {
 		set_vi_handler (MSC01E_INT_CPUCTR, mips_timer_dispatch);
@@ -303,22 +292,15 @@
 	else
 #endif
 	{
-		if (cpu_has_mips_r2)
-			/*
-			 * Read IntCtl.IPTI to determine the timer interrupt
-			 */
-			hwint = (read_c0_intctl () >> 29) & 7;
-		else
-			hwint = MIPSCPU_INT_CPUCTR;
 		if (cpu_has_vint)
-			set_vi_handler (hwint, mips_timer_dispatch);
-		mips_cpu_timer_irq = MIPSCPU_INT_BASE + hwint;
+			set_vi_handler(cp0_compare_irq, mips_timer_dispatch);
+		mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq;
 	}
 
 	/* we are using the cpu counter for timer interrupts */
 	irq->handler = mips_timer_interrupt;	/* we use our own handler */
 #ifdef CONFIG_MIPS_MT_SMTC
-	setup_irq_smtc(mips_cpu_timer_irq, irq, 0x100 << hwint);
+	setup_irq_smtc(mips_cpu_timer_irq, irq, 0x100 << cp0_compare_irq);
 #else
 	setup_irq(mips_cpu_timer_irq, irq);
 #endif /* CONFIG_MIPS_MT_SMTC */
diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c
index 1668cc2..c78d4834 100644
--- a/arch/mips/mips-boards/malta/malta_int.c
+++ b/arch/mips/mips-boards/malta/malta_int.c
@@ -257,7 +257,7 @@
 	if (irq == MIPSCPU_INT_I8259A)
 		malta_hw0_irqdispatch();
 	else if (irq > 0)
-		do_IRQ(MIPSCPU_INT_BASE + irq);
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 	else
 		spurious_interrupt();
 }
@@ -326,17 +326,17 @@
 		set_vi_handler (MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
 		set_vi_handler (MIPSCPU_INT_COREHI, corehi_irqdispatch);
 #ifdef CONFIG_MIPS_MT_SMTC
-		setup_irq_smtc (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq,
+		setup_irq_smtc (MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
 			(0x100 << MIPSCPU_INT_I8259A));
-		setup_irq_smtc (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI,
+		setup_irq_smtc (MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
 			&corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
 #else /* Not SMTC */
-		setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq);
-		setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction);
+		setup_irq (MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
+		setup_irq (MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction);
 #endif /* CONFIG_MIPS_MT_SMTC */
 	}
 	else {
-		setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_I8259A, &i8259irq);
-		setup_irq (MIPSCPU_INT_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction);
+		setup_irq (MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
+		setup_irq (MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI, &corehi_irqaction);
 	}
 }
diff --git a/arch/mips/mips-boards/sead/sead_int.c b/arch/mips/mips-boards/sead/sead_int.c
index c4b9de3..9ca0f82 100644
--- a/arch/mips/mips-boards/sead/sead_int.c
+++ b/arch/mips/mips-boards/sead/sead_int.c
@@ -106,7 +106,7 @@
 	irq = irq_ffs(pending);
 
 	if (irq >= 0)
-		do_IRQ(MIPSCPU_INT_BASE + irq);
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 	else
 		spurious_interrupt();
 }
diff --git a/arch/mips/mips-boards/sead/sead_setup.c b/arch/mips/mips-boards/sead/sead_setup.c
index 811aba1..bb80140 100644
--- a/arch/mips/mips-boards/sead/sead_setup.c
+++ b/arch/mips/mips-boards/sead/sead_setup.c
@@ -68,7 +68,7 @@
 #else
 	s.iobase = SEAD_UART0_REGS_BASE+3;
 #endif
-	s.irq = MIPSCPU_INT_BASE + MIPSCPU_INT_UART0;
+	s.irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_UART0;
 	s.uartclk = SEAD_BASE_BAUD * 16;
 	s.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ;
 	s.iotype = UPIO_PORT;
diff --git a/arch/mips/mips-boards/sim/sim_int.c b/arch/mips/mips-boards/sim/sim_int.c
index 15ac065..766e015 100644
--- a/arch/mips/mips-boards/sim/sim_int.c
+++ b/arch/mips/mips-boards/sim/sim_int.c
@@ -77,7 +77,7 @@
 	irq = irq_ffs(pending);
 
 	if (irq > 0)
-		do_IRQ(MIPSCPU_INT_BASE + irq);
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 	else
 		spurious_interrupt();
 }
diff --git a/arch/mips/mips-boards/sim/sim_time.c b/arch/mips/mips-boards/sim/sim_time.c
index d3a21c7..7224ffe 100644
--- a/arch/mips/mips-boards/sim/sim_time.c
+++ b/arch/mips/mips-boards/sim/sim_time.c
@@ -71,8 +71,8 @@
 
 	int vpflags = dvpe();
 	write_c0_compare (read_c0_count() - 1);
-	clear_c0_cause(0x100 << MIPSCPU_INT_CPUCTR);
-	set_c0_status(0x100 << MIPSCPU_INT_CPUCTR);
+	clear_c0_cause(0x100 << cp0_compare_irq);
+	set_c0_status(0x100 << cp0_compare_irq);
 	irq_enable_hazard();
 	evpe(vpflags);
 
@@ -183,8 +183,8 @@
 	}
 	else {
 		if (cpu_has_vint)
-			set_vi_handler(MIPSCPU_INT_CPUCTR, mips_timer_dispatch);
-		mips_cpu_timer_irq = MIPSCPU_INT_BASE + MIPSCPU_INT_CPUCTR;
+			set_vi_handler(cp0_compare_irq, mips_timer_dispatch);
+		mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq;
 	}
 
 	/* we are using the cpu counter for timer interrupts */