1#ifndef _LINUX_KERNEL_H
2#define _LINUX_KERNEL_H
3
4#include <linux/types.h>
5#include <linux/printk.h>
6
7#define USHRT_MAX ((u16)(~0U))
8#define SHRT_MAX ((s16)(USHRT_MAX>>1))
9#define SHRT_MIN ((s16)(-SHRT_MAX - 1))
10#define INT_MAX ((int)(~0U>>1))
11#define INT_MIN (-INT_MAX - 1)
12#define UINT_MAX (~0U)
13#define LONG_MAX ((long)(~0UL>>1))
14#define LONG_MIN (-LONG_MAX - 1)
15#define ULONG_MAX (~0UL)
16#define LLONG_MAX ((long long)(~0ULL>>1))
17#define LLONG_MIN (-LLONG_MAX - 1)
18#define ULLONG_MAX (~0ULL)
19#ifndef SIZE_MAX
20#define SIZE_MAX (~(size_t)0)
21#endif
22#ifndef SSIZE_MAX
23#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1))
24#endif
25
26#define U8_MAX ((u8)~0U)
27#define S8_MAX ((s8)(U8_MAX>>1))
28#define S8_MIN ((s8)(-S8_MAX - 1))
29#define U16_MAX ((u16)~0U)
30#define S16_MAX ((s16)(U16_MAX>>1))
31#define S16_MIN ((s16)(-S16_MAX - 1))
32#define U32_MAX ((u32)~0U)
33#define S32_MAX ((s32)(U32_MAX>>1))
34#define S32_MIN ((s32)(-S32_MAX - 1))
35#define U64_MAX ((u64)~0ULL)
36#define S64_MAX ((s64)(U64_MAX>>1))
37#define S64_MIN ((s64)(-S64_MAX - 1))
38
39
40#define UINT32_MAX U32_MAX
41#define UINT64_MAX U64_MAX
42
43#define INT32_MAX S32_MAX
44
45#define STACK_MAGIC 0xdeadbeef
46
47#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
48
49#define ALIGN(x,a) __ALIGN_MASK((x),(typeof(x))(a)-1)
50#define ALIGN_DOWN(x, a) ALIGN((x) - ((a) - 1), (a))
51#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
52#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
53#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
54
55#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
56
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61
62
63#define __round_mask(x, y) ((__typeof__(x))((y)-1))
64#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
65#define round_down(x, y) ((x) & ~__round_mask(x, y))
66
67#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
68#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
69
70#define DIV_ROUND_DOWN_ULL(ll, d) \
71 ({ unsigned long long _tmp = (ll); do_div(_tmp, d); _tmp; })
72
73#define DIV_ROUND_UP_ULL(ll, d) DIV_ROUND_DOWN_ULL((ll) + (d) - 1, (d))
74
75#define ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
76
77#if BITS_PER_LONG == 32
78# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
79#else
80# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
81#endif
82
83
84#define roundup(x, y) ( \
85{ \
86 const typeof(y) __y = y; \
87 (((x) + (__y - 1)) / __y) * __y; \
88} \
89)
90#define rounddown(x, y) ( \
91{ \
92 typeof(x) __x = (x); \
93 __x - (__x % (y)); \
94} \
95)
96
97
98
99
100
101
102#define DIV_ROUND_CLOSEST(x, divisor)( \
103{ \
104 typeof(x) __x = x; \
105 typeof(divisor) __d = divisor; \
106 (((typeof(x))-1) > 0 || \
107 ((typeof(divisor))-1) > 0 || (__x) > 0) ? \
108 (((__x) + ((__d) / 2)) / (__d)) : \
109 (((__x) - ((__d) / 2)) / (__d)); \
110} \
111)
112
113
114
115
116#define DIV_ROUND_CLOSEST_ULL(x, divisor)( \
117{ \
118 typeof(divisor) __d = divisor; \
119 unsigned long long _tmp = (x) + (__d) / 2; \
120 do_div(_tmp, __d); \
121 _tmp; \
122} \
123)
124
125
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127
128
129#define mult_frac(x, numer, denom)( \
130{ \
131 typeof(x) quot = (x) / (denom); \
132 typeof(x) rem = (x) % (denom); \
133 (quot * (numer)) + ((rem * (numer)) / (denom)); \
134} \
135)
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143
144
145#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
146
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150
151#define lower_32_bits(n) ((u32)(n))
152
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158
159#define abs(x) ({ \
160 long ret; \
161 if (sizeof(x) == sizeof(long)) { \
162 long __x = (x); \
163 ret = (__x < 0) ? -__x : __x; \
164 } else { \
165 int __x = (x); \
166 ret = (__x < 0) ? -__x : __x; \
167 } \
168 ret; \
169 })
170
171#define abs64(x) ({ \
172 s64 __x = (x); \
173 (__x < 0) ? -__x : __x; \
174 })
175
176
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179
180
181#define min(x, y) ({ \
182 typeof(x) _min1 = (x); \
183 typeof(y) _min2 = (y); \
184 (void) (&_min1 == &_min2); \
185 _min1 < _min2 ? _min1 : _min2; })
186
187#define max(x, y) ({ \
188 typeof(x) _max1 = (x); \
189 typeof(y) _max2 = (y); \
190 (void) (&_max1 == &_max2); \
191 _max1 > _max2 ? _max1 : _max2; })
192
193#define min3(x, y, z) min((typeof(x))min(x, y), z)
194#define max3(x, y, z) max((typeof(x))max(x, y), z)
195
196
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198
199
200
201#define min_not_zero(x, y) ({ \
202 typeof(x) __x = (x); \
203 typeof(y) __y = (y); \
204 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
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214
215#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
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222
223#define min_t(type, x, y) ({ \
224 type __min1 = (x); \
225 type __min2 = (y); \
226 __min1 < __min2 ? __min1: __min2; })
227
228#define max_t(type, x, y) ({ \
229 type __max1 = (x); \
230 type __max2 = (y); \
231 __max1 > __max2 ? __max1: __max2; })
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241
242
243#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
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255
256#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
257
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260
261
262#define swap(a, b) \
263 do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
264
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270
271
272#define container_of(ptr, type, member) ({ \
273 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
274 (type *)( (char *)__mptr - offsetof(type,member) );})
275
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281
282
283#define check_member(structure, member, offset) _Static_assert( \
284 offsetof(struct structure, member) == (offset), \
285 "`struct " #structure "` offset for `" #member "` is not " #offset)
286
287#endif
288