1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4882a593Smuzhiyun /* const.h: Macros for dealing with constants. */ 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun #ifndef _UAPI_LINUX_CONST_H 5*4882a593Smuzhiyun #define _UAPI_LINUX_CONST_H 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun /* Some constant macros are used in both assembler and 8*4882a593Smuzhiyun * C code. Therefore we cannot annotate them always with 9*4882a593Smuzhiyun * 'UL' and other type specifiers unilaterally. We 10*4882a593Smuzhiyun * use the following macros to deal with this. 11*4882a593Smuzhiyun * 12*4882a593Smuzhiyun * Similarly, _AT() will cast an expression with a type in C, but 13*4882a593Smuzhiyun * leave it unchanged in asm. 14*4882a593Smuzhiyun */ 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #ifdef __ASSEMBLY__ 17*4882a593Smuzhiyun #define _AC(X,Y) X 18*4882a593Smuzhiyun #define _AT(T,X) X 19*4882a593Smuzhiyun #else 20*4882a593Smuzhiyun #define __AC(X,Y) (X##Y) 21*4882a593Smuzhiyun #define _AC(X,Y) __AC(X,Y) 22*4882a593Smuzhiyun #define _AT(T,X) ((T)(X)) 23*4882a593Smuzhiyun #endif 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun #define _UL(x) (_AC(x, UL)) 26*4882a593Smuzhiyun #define _ULL(x) (_AC(x, ULL)) 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun #define _BITUL(x) (_UL(1) << (x)) 29*4882a593Smuzhiyun #define _BITULL(x) (_ULL(1) << (x)) 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) 32*4882a593Smuzhiyun #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #endif /* _UAPI_LINUX_CONST_H */ 37