move UL() macro from armv8/mmu.h into common.h

The UL() macro is pretty useful in sharing constants between assembly
and C files while still being able to specify a type for C.
Move the macro from an armv8 specific header into a common header file
to be able to use it by arm code (for instance) as well.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Jagan Teki <jagan@openedev.com>

arch/arm/include/asm/armv8/mmu.h

@@ -8,14 +8,6 @@
 #ifndef _ASM_ARMV8_MMU_H_
 #define _ASM_ARMV8_MMU_H_
 
-#ifdef __ASSEMBLY__
-#define _AC(X, Y)	X
-#else
-#define _AC(X, Y)	(X##Y)
-#endif
-
-#define UL(x)		_AC(x, UL)
-
 /***************************************************************/
 /*
  * The following definitions are related each other, shoud be

include/common.h

@@ -15,6 +15,9 @@ typedef volatile unsigned long	vu_long;
 typedef volatile unsigned short vu_short;
 typedef volatile unsigned char	vu_char;
 
+/* Allow sharing constants with type modifiers between C and assembly. */
+#define _AC(X, Y)       (X##Y)
+
 #include <config.h>
 #include <errno.h>
 #include <asm-offsets.h>
@@ -936,7 +939,12 @@ int cpu_disable(int nr);
 int cpu_release(int nr, int argc, char * const argv[]);
 #endif
 
-#endif /* __ASSEMBLY__ */
+#else	/* __ASSEMBLY__ */
+
+/* Drop a C type modifier (like in 3UL) for constants used in assembly. */
+#define _AC(X, Y)       X
+
+#endif	/* __ASSEMBLY__ */
 
 #ifdef CONFIG_PPC
 /*
@@ -948,6 +956,9 @@ int cpu_release(int nr, int argc, char * const argv[]);
 
 /* Put only stuff here that the assembler can digest */
 
+/* Declare an unsigned long constant digestable both by C and an assembler. */
+#define UL(x)           _AC(x, UL)
+
 #ifdef CONFIG_POST
 #define CONFIG_HAS_POST
 #ifndef CONFIG_POST_ALT_LIST