1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* const.h: Macros for dealing with constants. */ 3 4 #ifndef _LINUX_CONST_H 5 #define _LINUX_CONST_H 6 7 /* Some constant macros are used in both assembler and 8 * C code. Therefore we cannot annotate them always with 9 * 'UL' and other type specifiers unilaterally. We 10 * use the following macros to deal with this. 11 * 12 * Similarly, _AT() will cast an expression with a type in C, but 13 * leave it unchanged in asm. 14 */ 15 16 #ifdef __ASSEMBLY__ 17 #define _AC(X,Y) X 18 #define _AT(T,X) X 19 #else 20 #define __AC(X,Y) (X##Y) 21 #define _AC(X,Y) __AC(X,Y) 22 #define _AT(T,X) ((T)(X)) 23 #endif 24 25 #define _BITUL(x) (_AC(1,UL) << (x)) 26 #define _BITULL(x) (_AC(1,ULL) << (x)) 27 28 #endif /* !(_LINUX_CONST_H) */ 29
