1 files changed, 5 insertions, 2 deletions

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 308e43460864..31b204b26ba0 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1403,6 +1403,7 @@ extern void flush_tlb_handlers(void);
  * Timer interrupt
  */
 int cp0_compare_irq;
+int cp0_compare_irq_shift;
 
 /*
  * Performance counter IRQ or -1 if shared with timer
@@ -1493,12 +1494,14 @@ void __cpuinit per_cpu_trap_init(void)
          *  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 = (read_c0_intctl() >> 26) & 7;
+                cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP;
+                cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7;
+                cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7;
                 if (cp0_perfcount_irq == cp0_compare_irq)
                         cp0_perfcount_irq = -1;
         } else {
                 cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ;
+                cp0_compare_irq_shift = cp0_compare_irq;
                 cp0_perfcount_irq = -1;
         }