1 files changed, 9 insertions, 3 deletions

diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S
index 9a029d40f6cf..6bfcb7a00ec6 100644
--- a/arch/mips/kernel/mcount.S
+++ b/arch/mips/kernel/mcount.S
@@ -57,6 +57,12 @@
          move ra, AT
         .endm
 
+/*
+ * The -mmcount-ra-address option of gcc 4.5 uses register $12 to pass
+ * the location of the parent's return address.
+ */
+#define MCOUNT_RA_ADDRESS_REG   $12
+
 #ifdef CONFIG_DYNAMIC_FTRACE
 
 NESTED(ftrace_caller, PT_SIZE, ra)
@@ -70,7 +76,7 @@ _mcount:
 
         MCOUNT_SAVE_REGS
 #ifdef KBUILD_MCOUNT_RA_ADDRESS
-        PTR_S   t0, PT_R12(sp)  /* save location of parent's return address */
+        PTR_S   MCOUNT_RA_ADDRESS_REG, PT_R12(sp)
 #endif
 
         move    a0, ra          /* arg1: self return address */
@@ -142,9 +148,9 @@ NESTED(ftrace_graph_caller, PT_SIZE, ra)
 #ifdef CONFIG_DYNAMIC_FTRACE
         PTR_L   a0, PT_R12(sp)
 #else
-        move    a0, t0
+        move    a0, MCOUNT_RA_ADDRESS_REG
 #endif
-        bnez    a0, 1f          /* non-leaf func: stored in t0 */
+        bnez    a0, 1f  /* non-leaf func: stored in MCOUNT_RA_ADDRESS_REG */
          nop
 #endif
         PTR_LA  a0, PT_R1(sp)   /* leaf func: the location in current stack */