1b3c818a4SEric Farman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2b3c818a4SEric Farman /* const.h: Macros for dealing with constants. */ 3b3c818a4SEric Farman 4b3c818a4SEric Farman #ifndef _LINUX_CONST_H 5b3c818a4SEric Farman #define _LINUX_CONST_H 6b3c818a4SEric Farman 7b3c818a4SEric Farman /* Some constant macros are used in both assembler and 8b3c818a4SEric Farman * C code. Therefore we cannot annotate them always with 9b3c818a4SEric Farman * 'UL' and other type specifiers unilaterally. We 10b3c818a4SEric Farman * use the following macros to deal with this. 11b3c818a4SEric Farman * 12b3c818a4SEric Farman * Similarly, _AT() will cast an expression with a type in C, but 13b3c818a4SEric Farman * leave it unchanged in asm. 14b3c818a4SEric Farman */ 15b3c818a4SEric Farman 16b3c818a4SEric Farman #ifdef __ASSEMBLY__ 17b3c818a4SEric Farman #define _AC(X,Y) X 18b3c818a4SEric Farman #define _AT(T,X) X 19b3c818a4SEric Farman #else 20b3c818a4SEric Farman #define __AC(X,Y) (X##Y) 21b3c818a4SEric Farman #define _AC(X,Y) __AC(X,Y) 22b3c818a4SEric Farman #define _AT(T,X) ((T)(X)) 23b3c818a4SEric Farman #endif 24b3c818a4SEric Farman 25b3c818a4SEric Farman #define _UL(x) (_AC(x, UL)) 26b3c818a4SEric Farman #define _ULL(x) (_AC(x, ULL)) 27b3c818a4SEric Farman 28b3c818a4SEric Farman #define _BITUL(x) (_UL(1) << (x)) 29b3c818a4SEric Farman #define _BITULL(x) (_ULL(1) << (x)) 30b3c818a4SEric Farman 31*d0bf492fSCédric Le Goater #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) 32b3c818a4SEric Farman #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 33b3c818a4SEric Farman 34b3c818a4SEric Farman #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 35b3c818a4SEric Farman 36b3c818a4SEric Farman #endif /* _LINUX_CONST_H */ 37