linux/const.h: Add _BITUL() and _BITULL()

Add macros for single bit definitions of a specific type. These are
similar to the BIT() macro that already exists, but with a few
exceptions:

1. The namespace is such that they can be used in uapi definitions.
2. The type is set with the _AC() macro to allow it to be used in
assembly.
3. The type is explicitly specified to be UL or ULL.

Signed-off-by: H. Peter Anvin <[e-mail]>
Link: http://lkml.kernel.org/n/[e-mail]

include/uapi/linux/const.h

···
 #define _AT(T,X)	((T)(X))
 #endif
 
+#define _BITUL(x)	(_AC(1,UL) << (x))
+#define _BITULL(x)	(_AC(1,ULL) << (x))
+
 #endif /* !(_LINUX_CONST_H) */