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6f52b16c | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
9d291e78 VG |
2 | /* const.h: Macros for dealing with constants. */ |
3 | ||
2a6cc8a6 MY |
4 | #ifndef _UAPI_LINUX_CONST_H |
5 | #define _UAPI_LINUX_CONST_H | |
9d291e78 VG |
6 | |
7 | /* Some constant macros are used in both assembler and | |
8 | * C code. Therefore we cannot annotate them always with | |
6df95fd7 | 9 | * 'UL' and other type specifiers unilaterally. We |
9d291e78 | 10 | * use the following macros to deal with this. |
74ef649f JF |
11 | * |
12 | * Similarly, _AT() will cast an expression with a type in C, but | |
13 | * leave it unchanged in asm. | |
9d291e78 VG |
14 | */ |
15 | ||
16 | #ifdef __ASSEMBLY__ | |
17 | #define _AC(X,Y) X | |
74ef649f | 18 | #define _AT(T,X) X |
9d291e78 VG |
19 | #else |
20 | #define __AC(X,Y) (X##Y) | |
21 | #define _AC(X,Y) __AC(X,Y) | |
74ef649f | 22 | #define _AT(T,X) ((T)(X)) |
9d291e78 VG |
23 | #endif |
24 | ||
2dd8a62c MY |
25 | #define _UL(x) (_AC(x, UL)) |
26 | #define _ULL(x) (_AC(x, ULL)) | |
27 | ||
21e7bc60 MY |
28 | #define _BITUL(x) (_UL(1) << (x)) |
29 | #define _BITULL(x) (_ULL(1) << (x)) | |
2fc016c5 | 30 | |
bd2e35dd PV |
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 | ||
2a6cc8a6 | 36 | #endif /* _UAPI_LINUX_CONST_H */ |