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