microblaze: Fix put_user macro for 64bits arguments

For 64bits arguments gcc caused that put_user macro
works with wrong value because of optimalization.
Adding volatile caused that gcc not optimized it.

It is possible to use (as Blackfin do) two put_user
macros with 32bits arguments but there is one more
instruction which is due to duplication zero return
value which is called put_user_asm macro.

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 65adad61e7e9..5431b4631a7a 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -189,7 +189,7 @@ extern long strnlen_user(const char *src, long count);
 
 #define __put_user(x, ptr)                                              \
 ({                                                                      \
-        __typeof__(*(ptr)) __gu_val = x;                                \
+        __typeof__(*(ptr)) volatile __gu_val = (x);                     \
         long __gu_err = 0;                                              \
         switch (sizeof(__gu_val)) {                                     \
         case 1:                                                         \