[PATCH v2 7/8] x86: move stac()/clac() from {get,put}_unsafe_asm() ...

[Jan Beulich <jbeulich@xxxxxxxx>]

... to {get,put}_unsafe_size(). There's no need to have the macros
expanded once per case label in the latter. This also makes the former
well-formed single statements again. No change in generated code.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/include/asm-x86/uaccess.h
+++ b/xen/include/asm-x86/uaccess.h
@@ -154,7 +154,6 @@ struct __large_struct { unsigned long bu
  * aliasing issues.
  */
 #define put_unsafe_asm(x, addr, GUARD, err, itype, rtype, ltype, errret) \
-       stac();                                                         \
        __asm__ __volatile__(                                           \
                GUARD(                                                  \
                "       guest_access_mask_ptr %[ptr], %[scr1], %[scr2]\n" \
@@ -169,11 +168,9 @@ struct __large_struct { unsigned long bu
                : [ret] "+r" (err), [ptr] "=&r" (dummy_)                \
                  GUARD(, [scr1] "=&r" (dummy_), [scr2] "=&r" (dummy_)) \
                : [val] ltype (x), "m" (__m(addr)),                     \
-                 "[ptr]" (addr), [errno] "i" (errret));                \
-       clac()
+                 "[ptr]" (addr), [errno] "i" (errret))
 
 #define get_unsafe_asm(x, addr, GUARD, err, rtype, ltype, errret)      \
-       stac();                                                         \
        __asm__ __volatile__(                                           \
                GUARD(                                                  \
                "       guest_access_mask_ptr %[ptr], %[scr1], %[scr2]\n" \
@@ -190,12 +187,12 @@ struct __large_struct { unsigned long bu
                  [ptr] "=&r" (dummy_)                                  \
                  GUARD(, [scr1] "=&r" (dummy_), [scr2] "=&r" (dummy_)) \
                : "m" (__m(addr)), "[ptr]" (addr),                      \
-                 [errno] "i" (errret));                                \
-       clac()
+                 [errno] "i" (errret))
 
 #define put_unsafe_size(x, ptr, size, grd, retval, errret)                 \
 do {                                                                       \
     retval = 0;                                                            \
+    stac();                                                                \
     switch ( size )                                                        \
     {                                                                      \
     long dummy_;                                                           \
@@ -213,6 +210,7 @@ do {
         break;                                                             \
     default: __put_user_bad();                                             \
     }                                                                      \
+    clac();                                                                \
 } while ( false )
 
 #define put_guest_size(x, ptr, size, retval, errret) \
@@ -221,6 +219,7 @@ do {
 #define get_unsafe_size(x, ptr, size, grd, retval, errret)                 \
 do {                                                                       \
     retval = 0;                                                            \
+    stac();                                                                \
     switch ( size )                                                        \
     {                                                                      \
     long dummy_;                                                           \
@@ -230,6 +229,7 @@ do {
     case 8: get_unsafe_asm(x, ptr, grd, retval,  "", "=r", errret); break; \
     default: __get_user_bad();                                             \
     }                                                                      \
+    clac();                                                                \
 } while ( false )
 
 #define get_guest_size(x, ptr, size, retval, errret)                       \