1 /* 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #ifndef _LINUX_KERNEL_H_ 31 #define _LINUX_KERNEL_H_ 32 33 #include <sys/stdarg.h> 34 #include <linux/stddef.h> 35 #include <linux/types.h> 36 #include <linux/compiler.h> 37 #include <linux/bitops.h> 38 #include <linux/log2.h> 39 #include <linux/printk.h> 40 41 #include <sys/systm.h> 42 #include <sys/param.h> 43 #include <sys/libkern.h> 44 #include <sys/stat.h> 45 #include <sys/endian.h> 46 47 #define U8_MAX ((u8)~0U) 48 #define U32_MAX ((u32)~0U) 49 #define U64_MAX ((u64)~0ULL) 50 51 #include <machine/limits.h> /* LONG_MAX etc... */ 52 53 #undef ALIGN 54 #define ALIGN(x, y) roundup2((x), (y)) 55 #define IS_ALIGNED(x, y) (((x) & ((y) - 1)) == 0) 56 #define DIV_ROUND_UP howmany 57 #define DIV_ROUND_UP_ULL(X, N) DIV_ROUND_UP((unsigned long long)(X), (N)) 58 59 #define udelay(t) DELAY(t) 60 61 #define container_of(ptr, type, member) \ 62 ({ \ 63 __typeof(((type *)0)->member) *_p = (ptr); \ 64 (type *)((char *)_p - offsetof(type, member)); \ 65 }) 66 67 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 68 69 #define simple_strtoul strtoul 70 #define simple_strtol strtol 71 72 #define min(x, y) ((x) < (y) ? (x) : (y)) 73 #define max(x, y) ((x) > (y) ? (x) : (y)) 74 75 #define min3(a, b, c) min(a, min(b,c)) 76 #define max3(a, b, c) max(a, max(b,c)) 77 78 #define min_t(type, _x, _y) ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y)) 79 #define max_t(type, _x, _y) ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y)) 80 81 #define clamp_t(type, _x, min, max) min_t(type, max_t(type, _x, min), max) 82 #define clamp(x, lo, hi) min( max(x,lo), hi) 83 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) 84 85 /* 86 * This looks more complex than it should be. But we need to 87 * get the type for the ~ right in round_down (it needs to be 88 * as wide as the result!), and we want to evaluate the macro 89 * arguments just once each. 90 */ 91 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 92 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 93 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 94 95 #define num_possible_cpus() mp_ncpus 96 97 typedef struct pm_message { 98 int event; 99 } pm_message_t; 100 101 /* Swap values of a and b */ 102 #define swap(a, b) \ 103 ({ \ 104 typeof(a) _swap_tmp = a; \ 105 a = b; \ 106 b = _swap_tmp; \ 107 }) 108 109 #define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) /2)) / (divisor)) 110 111 static inline uintmax_t 112 mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor) 113 { 114 uintmax_t q = (x / divisor); 115 uintmax_t r = (x % divisor); 116 117 return ((q * multiplier) + ((r * multiplier) / divisor)); 118 } 119 120 static inline int64_t abs64(int64_t x) 121 { 122 return (x < 0 ? -x : x); 123 } 124 125 #define DIV_ROUND_CLOSEST_ULL(ll, d) \ 126 ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; }) 127 128 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 129 #define lower_32_bits(n) ((u32)(n)) 130 131 /* Byteorder compat layer */ 132 #if _BYTE_ORDER == _BIG_ENDIAN 133 #define __BIG_ENDIAN 4321 134 #else 135 #define __LITTLE_ENDIAN 1234 136 #endif 137 138 #define cpu_to_le16(x) htole16(x) 139 #define le16_to_cpu(x) le16toh(x) 140 #define cpu_to_le32(x) htole32(x) 141 #define le32_to_cpu(x) le32toh(x) 142 #define le32_to_cpup(x) le32toh(*x) 143 144 #define cpu_to_be16(x) htobe16(x) 145 #define be16_to_cpu(x) be16toh(x) 146 #define cpu_to_be32(x) htobe32(x) 147 #define be32_to_cpu(x) be32toh(x) 148 #define be32_to_cpup(x) be32toh(*x) 149 150 static inline int __must_check 151 kstrtouint(const char *s, unsigned int base, unsigned int *res) 152 { 153 *(res) = strtol(s,0,base); 154 155 return 0; 156 } 157 158 char *kvasprintf(int flags, const char *format, va_list ap); 159 char *kasprintf(int flags, const char *format, ...); 160 161 static inline void __user * 162 u64_to_user_ptr(u64 address) 163 { 164 return (void __user *)(uintptr_t)address; 165 } 166 167 static inline void 168 might_sleep(void) 169 { 170 } 171 172 #define snprintf ksnprintf 173 #define sprintf ksprintf 174 175 static inline int __printf(3, 0) 176 vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 177 { 178 return kvsnprintf(buf, size, fmt, args); 179 } 180 181 static inline int __printf(3, 0) 182 vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 183 { 184 int ret; 185 186 if (size == 0) 187 return 0; 188 189 ret = vsnprintf(buf, size, fmt, args); 190 if (ret < size) 191 return ret; 192 193 return size - 1; 194 } 195 196 static inline int __printf(3, 4) 197 scnprintf(char *buf, size_t size, const char *fmt, ...) 198 { 199 va_list args; 200 int i; 201 202 va_start(args, fmt); 203 i = vscnprintf(buf, size, fmt, args); 204 va_end(args); 205 206 return (i); 207 } 208 209 static inline int 210 kstrtol(const char *cp, unsigned int base, long *res) 211 { 212 char *end; 213 214 *res = strtol(cp, &end, base); 215 216 /* skip newline character, if any */ 217 if (*end == '\n') 218 end++; 219 if (*cp == 0 || *end != 0) 220 return (-EINVAL); 221 return (0); 222 } 223 224 #define oops_in_progress (panicstr != NULL) 225 226 enum lockdep_ok { 227 LOCKDEP_STILL_OK, 228 LOCKDEP_NOW_UNRELIABLE 229 }; 230 231 #define TAINT_MACHINE_CHECK 4 232 233 static inline void 234 add_taint(unsigned flag, enum lockdep_ok lo) 235 { 236 } 237 238 #endif /* _LINUX_KERNEL_H_ */ 239