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