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- /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
- /* const.h: Macros for dealing with constants. */
- #pragma once
- #ifndef _UAPI_LINUX_CONST_H
- #define _UAPI_LINUX_CONST_H
- /* Some constant macros are used in both assembler and
- * C code. Therefore we cannot annotate them always with
- * 'UL' and other type specifiers unilaterally. We
- * use the following macros to deal with this.
- *
- * Similarly, _AT() will cast an expression with a type in C, but
- * leave it unchanged in asm.
- */
- #ifdef __ASSEMBLY__
- #define _AC(X,Y) X
- #define _AT(T,X) X
- #else
- #define __AC(X,Y) (X##Y)
- #define _AC(X,Y) __AC(X,Y)
- #define _AT(T,X) ((T)(X))
- #endif
- #define _UL(x) (_AC(x, UL))
- #define _ULL(x) (_AC(x, ULL))
- #define _BITUL(x) (_UL(1) << (x))
- #define _BITULL(x) (_ULL(1) << (x))
- #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1)
- #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
- #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
- /*
- * This returns a constant expression while determining if an argument is
- * a constant expression, most importantly without evaluating the argument.
- * Glory to Martin Uecker <[email protected]>
- */
- #define __is_constexpr(x) \
- (sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
- #endif /* _UAPI_LINUX_CONST_H */
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