✏️ 编辑：const.h
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/usr/include/linux/const.h
大小：987 B · 修改：2026-10-14 17:16:55 · 权限：0644 · 只读（保存会失败）
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* const.h: Macros for dealing with constants. */ #ifndef _LINUX_CONST_H #define _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)) #endif /* _LINUX_CONST_H */
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