1 files changed, 6 insertions, 5 deletions

diff --git a/arch/powerpc/oprofile/backtrace.c b/arch/powerpc/oprofile/backtrace.c
index 75f57bc96b40..b4278cfd1f80 100644
--- a/arch/powerpc/oprofile/backtrace.c
+++ b/arch/powerpc/oprofile/backtrace.c
@@ -11,6 +11,7 @@
 #include <linux/sched.h>
 #include <asm/processor.h>
 #include <asm/uaccess.h>
+#include <asm/compat.h>
 
 #define STACK_SP(STACK)         *(STACK)
 
@@ -26,8 +27,9 @@
 static unsigned int user_getsp32(unsigned int sp, int is_first)
 {
         unsigned int stack_frame[2];
+        void __user *p = compat_ptr(sp);
 
-        if (!access_ok(VERIFY_READ, sp, sizeof(stack_frame)))
+        if (!access_ok(VERIFY_READ, p, sizeof(stack_frame)))
                 return 0;
 
         /*
@@ -35,8 +37,7 @@ static unsigned int user_getsp32(unsigned int sp, int is_first)
          * which means that we've done all that we can do from
          * interrupt context.
          */
-        if (__copy_from_user_inatomic(stack_frame, (void *)(long)sp,
-                                        sizeof(stack_frame)))
+        if (__copy_from_user_inatomic(stack_frame, p, sizeof(stack_frame)))
                 return 0;
 
         if (!is_first)
@@ -54,10 +55,10 @@ static unsigned long user_getsp64(unsigned long sp, int is_first)
 {
         unsigned long stack_frame[3];
 
-        if (!access_ok(VERIFY_READ, sp, sizeof(stack_frame)))
+        if (!access_ok(VERIFY_READ, (void __user *)sp, sizeof(stack_frame)))
                 return 0;
 
-        if (__copy_from_user_inatomic(stack_frame, (void *)sp,
+        if (__copy_from_user_inatomic(stack_frame, (void __user *)sp,
                                         sizeof(stack_frame)))
                 return 0;