Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __TOOLS_LINUX_KERNEL_H
2#define __TOOLS_LINUX_KERNEL_H
3
4#include <stdarg.h>
5#include <stddef.h>
6#include <assert.h>
7#include <linux/compiler.h>
8
9#ifndef UINT_MAX
10#define UINT_MAX (~0U)
11#endif
12
13#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
14
15#define PERF_ALIGN(x, a) __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
16#define __PERF_ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
17
18#ifndef offsetof
19#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
20#endif
21
22#ifndef container_of
23/**
24 * container_of - cast a member of a structure out to the containing structure
25 * @ptr: the pointer to the member.
26 * @type: the type of the container struct this is embedded in.
27 * @member: the name of the member within the struct.
28 *
29 */
30#define container_of(ptr, type, member) ({ \
31 const typeof(((type *)0)->member) * __mptr = (ptr); \
32 (type *)((char *)__mptr - offsetof(type, member)); })
33#endif
34
35#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
36
37#ifndef max
38#define max(x, y) ({ \
39 typeof(x) _max1 = (x); \
40 typeof(y) _max2 = (y); \
41 (void) (&_max1 == &_max2); \
42 _max1 > _max2 ? _max1 : _max2; })
43#endif
44
45#ifndef min
46#define min(x, y) ({ \
47 typeof(x) _min1 = (x); \
48 typeof(y) _min2 = (y); \
49 (void) (&_min1 == &_min2); \
50 _min1 < _min2 ? _min1 : _min2; })
51#endif
52
53#ifndef roundup
54#define roundup(x, y) ( \
55{ \
56 const typeof(y) __y = y; \
57 (((x) + (__y - 1)) / __y) * __y; \
58} \
59)
60#endif
61
62#ifndef BUG_ON
63#ifdef NDEBUG
64#define BUG_ON(cond) do { if (cond) {} } while (0)
65#else
66#define BUG_ON(cond) assert(!(cond))
67#endif
68#endif
69
70/*
71 * Both need more care to handle endianness
72 * (Don't use bitmap_copy_le() for now)
73 */
74#define cpu_to_le64(x) (x)
75#define cpu_to_le32(x) (x)
76
77int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
78int scnprintf(char * buf, size_t size, const char * fmt, ...);
79
80#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
81
82/*
83 * This looks more complex than it should be. But we need to
84 * get the type for the ~ right in round_down (it needs to be
85 * as wide as the result!), and we want to evaluate the macro
86 * arguments just once each.
87 */
88#define __round_mask(x, y) ((__typeof__(x))((y)-1))
89#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
90#define round_down(x, y) ((x) & ~__round_mask(x, y))
91
92#endif