include/types: move stddef.h-kind types to common header

size_t, ssize_t, and ptrdiff_t are all expected to be uniformly defined
on any ports Xen might gain. In particular I hope new ports can rely on
__SIZE_TYPE__ and __PTRDIFF_TYPE__ being made available by the compiler.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/arch/arm/include/asm/types.h

@@ -54,19 +54,6 @@ typedef u64 register_t;
 #define PRIregister "016lx"
 #endif
 
-#if defined(__SIZE_TYPE__)
-typedef __SIZE_TYPE__ size_t;
-#else
-typedef unsigned long size_t;
-#endif
-typedef signed long ssize_t;
-
-#if defined(__PTRDIFF_TYPE__)
-typedef __PTRDIFF_TYPE__ ptrdiff_t;
-#else
-typedef signed long ptrdiff_t;
-#endif
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ARM_TYPES_H__ */

xen/arch/x86/include/asm/types.h

@@ -32,19 +32,6 @@ typedef unsigned long paddr_t;
 #define INVALID_PADDR (~0UL)
 #define PRIpaddr "016lx"
 
-#if defined(__SIZE_TYPE__)
-typedef __SIZE_TYPE__ size_t;
-#else
-typedef unsigned long size_t;
-#endif
-typedef signed long ssize_t;
-
-#if defined(__PTRDIFF_TYPE__)
-typedef __PTRDIFF_TYPE__ ptrdiff_t;
-#else
-typedef signed long ptrdiff_t;
-#endif
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* __X86_TYPES_H__ */

xen/include/xen/types.h

@@ -5,6 +5,19 @@
 
 #include <asm/types.h>
 
+#if defined(__SIZE_TYPE__)
+typedef __SIZE_TYPE__ size_t;
+#else
+typedef unsigned long size_t;
+#endif
+typedef signed long ssize_t;
+
+#if defined(__PTRDIFF_TYPE__)
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+#else
+typedef signed long ptrdiff_t;
+#endif
+
 #define BITS_TO_LONGS(bits) \
     (((bits)+BITS_PER_LONG-1)/BITS_PER_LONG)
 #define DECLARE_BITMAP(name,bits) \