1 files changed, 7 insertions, 14 deletions

diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index e12c593ab9ca..3855ceb937b0 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -15,8 +15,8 @@
 #include <linux/list.h>
 
 #include <asm/cacheflush.h>
+#include <asm/ftrace.h>
 
-#define CALL_BACK               4
 
 static unsigned int ftrace_nop = 0x60000000;
 
@@ -27,9 +27,10 @@ static unsigned int ftrace_nop = 0x60000000;
 # define GET_ADDR(addr) *(unsigned long *)addr
 #endif
 
+
 static unsigned int notrace ftrace_calc_offset(long ip, long addr)
 {
-        return (int)((addr + CALL_BACK) - ip);
+        return (int)(addr - ip);
 }
 
 notrace unsigned char *ftrace_nop_replace(void)
@@ -76,9 +77,6 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
         unsigned new = *(unsigned *)new_code;
         int faulted = 0;
 
-        /* move the IP back to the start of the call */
-        ip -= CALL_BACK;
-
         /*
          * Note: Due to modules and __init, code can
          *  disappear and change, we need to protect against faulting
@@ -118,12 +116,10 @@ ftrace_modify_code(unsigned long ip, unsigned char *old_code,
 notrace int ftrace_update_ftrace_func(ftrace_func_t func)
 {
         unsigned long ip = (unsigned long)(&ftrace_call);
-        unsigned char old[4], *new;
+        unsigned char old[MCOUNT_INSN_SIZE], *new;
         int ret;
 
-        ip += CALL_BACK;
-
-        memcpy(old, &ftrace_call, 4);
+        memcpy(old, &ftrace_call, MCOUNT_INSN_SIZE);
         new = ftrace_call_replace(ip, (unsigned long)func);
         ret = ftrace_modify_code(ip, old, new);
 
@@ -134,16 +130,13 @@ notrace int ftrace_mcount_set(unsigned long *data)
 {
         unsigned long ip = (long)(&mcount_call);
         unsigned long *addr = data;
-        unsigned char old[4], *new;
-
-        /* ip is at the location, but modify code will subtact this */
-        ip += CALL_BACK;
+        unsigned char old[MCOUNT_INSN_SIZE], *new;
 
         /*
          * Replace the mcount stub with a pointer to the
          * ip recorder function.
          */
-        memcpy(old, &mcount_call, 4);
+        memcpy(old, &mcount_call, MCOUNT_INSN_SIZE);
         new = ftrace_call_replace(ip, *addr);
         *addr = ftrace_modify_code(ip, old, new);