1 files changed, 17 insertions, 3 deletions

diff --git a/arch/powerpc/kernel/perf_callchain.c b/arch/powerpc/kernel/perf_callchain.c
index d05ae4204bb..564c1d8bdb5 100644
--- a/arch/powerpc/kernel/perf_callchain.c
+++ b/arch/powerpc/kernel/perf_callchain.c
@@ -154,8 +154,12 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret)
             ((unsigned long)ptr & 7))
                 return -EFAULT;
 
-        if (!__get_user_inatomic(*ret, ptr))
+        pagefault_disable();
+        if (!__get_user_inatomic(*ret, ptr)) {
+                pagefault_enable();
                 return 0;
+        }
+        pagefault_enable();
 
         return read_user_stack_slow(ptr, ret, 8);
 }
@@ -166,8 +170,12 @@ static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret)
             ((unsigned long)ptr & 3))
                 return -EFAULT;
 
-        if (!__get_user_inatomic(*ret, ptr))
+        pagefault_disable();
+        if (!__get_user_inatomic(*ret, ptr)) {
+                pagefault_enable();
                 return 0;
+        }
+        pagefault_enable();
 
         return read_user_stack_slow(ptr, ret, 4);
 }
@@ -294,11 +302,17 @@ static inline int current_is_64bit(void)
  */
 static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret)
 {
+        int rc;
+
         if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) ||
             ((unsigned long)ptr & 3))
                 return -EFAULT;
 
-        return __get_user_inatomic(*ret, ptr);
+        pagefault_disable();
+        rc = __get_user_inatomic(*ret, ptr);
+        pagefault_enable();
+
+        return rc;
 }
 
 static inline void perf_callchain_user_64(struct perf_callchain_entry *entry,