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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 _UL(x) (_AC(x, UL)) | |
26 | #define _ULL(x) (_AC(x, ULL)) | |
27 | ||
28 | #define _BITUL(x) (_UL(1) << (x)) | |
29 | #define _BITULL(x) (_ULL(1) << (x)) | |
30 | ||
31 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1) | |
32 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) | |
33 | ||
34 | #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) | |
35 | ||
36 | #endif /* _LINUX_CONST_H */ |