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 */ |
37 | |