1*a71a9546SAutomerger Merge Worker /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*a71a9546SAutomerger Merge Worker /* const.h: Macros for dealing with constants. */ 3*a71a9546SAutomerger Merge Worker 4*a71a9546SAutomerger Merge Worker #ifndef _LINUX_CONST_H 5*a71a9546SAutomerger Merge Worker #define _LINUX_CONST_H 6*a71a9546SAutomerger Merge Worker 7*a71a9546SAutomerger Merge Worker /* Some constant macros are used in both assembler and 8*a71a9546SAutomerger Merge Worker * C code. Therefore we cannot annotate them always with 9*a71a9546SAutomerger Merge Worker * 'UL' and other type specifiers unilaterally. We 10*a71a9546SAutomerger Merge Worker * use the following macros to deal with this. 11*a71a9546SAutomerger Merge Worker * 12*a71a9546SAutomerger Merge Worker * Similarly, _AT() will cast an expression with a type in C, but 13*a71a9546SAutomerger Merge Worker * leave it unchanged in asm. 14*a71a9546SAutomerger Merge Worker */ 15*a71a9546SAutomerger Merge Worker 16*a71a9546SAutomerger Merge Worker #ifdef __ASSEMBLY__ 17*a71a9546SAutomerger Merge Worker #define _AC(X,Y) X 18*a71a9546SAutomerger Merge Worker #define _AT(T,X) X 19*a71a9546SAutomerger Merge Worker #else 20*a71a9546SAutomerger Merge Worker #define __AC(X,Y) (X##Y) 21*a71a9546SAutomerger Merge Worker #define _AC(X,Y) __AC(X,Y) 22*a71a9546SAutomerger Merge Worker #define _AT(T,X) ((T)(X)) 23*a71a9546SAutomerger Merge Worker #endif 24*a71a9546SAutomerger Merge Worker 25*a71a9546SAutomerger Merge Worker #define _UL(x) (_AC(x, UL)) 26*a71a9546SAutomerger Merge Worker #define _ULL(x) (_AC(x, ULL)) 27*a71a9546SAutomerger Merge Worker 28*a71a9546SAutomerger Merge Worker #define _BITUL(x) (_UL(1) << (x)) 29*a71a9546SAutomerger Merge Worker #define _BITULL(x) (_ULL(1) << (x)) 30*a71a9546SAutomerger Merge Worker 31*a71a9546SAutomerger Merge Worker #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) 32*a71a9546SAutomerger Merge Worker #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 33*a71a9546SAutomerger Merge Worker 34*a71a9546SAutomerger Merge Worker #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 35*a71a9546SAutomerger Merge Worker 36*a71a9546SAutomerger Merge Worker #endif /* _LINUX_CONST_H */ 37