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) 2014-2015 François Tigeot
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
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.
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.
32 #ifndef _LINUX_KERNEL_H_
33 #define _LINUX_KERNEL_H_
35 #include <sys/cdefs.h>
36 #include <sys/types.h>
37 #include <sys/systm.h>
38 #include <sys/param.h>
39 #include <sys/libkern.h>
42 #include <sys/stddef.h>
43 #include <sys/syslog.h>
45 #include <linux/bitops.h>
46 #include <linux/compiler.h>
47 #include <linux/errno.h>
48 #include <linux/kthread.h>
49 #include <linux/types.h>
50 #include <linux/jiffies.h>
51 #include <linux/wait.h>
52 #include <linux/log2.h>
53 #include <asm/byteorder.h>
56 #define KERN_EMERG "<0>"
57 #define KERN_ALERT "<1>"
58 #define KERN_CRIT "<2>"
59 #define KERN_ERR "<3>"
60 #define KERN_WARNING "<4>"
61 #define KERN_NOTICE "<5>"
62 #define KERN_INFO "<6>"
63 #define KERN_DEBUG "<7>"
65 #define BUILD_BUG_ON(x) CTASSERT(!(x))
67 #define BUG() panic("BUG")
68 #define BUG_ON(condition) do { if (condition) BUG(); } while(0)
69 #define WARN_ON BUG_ON
72 #define ALIGN(x, y) roundup2((x), (y))
74 #define PTR_ALIGN(p, a) ((__typeof(p))ALIGN((uintptr_t)(p), (a)))
75 #define DIV_ROUND_UP(x, n) howmany(x, n)
76 #define DIV_ROUND_UP_ULL(x, n) DIV_ROUND_UP((unsigned long long)(x), (n))
77 #define FIELD_SIZEOF(t, f) sizeof(((t *)0)->f)
79 #define printk(X...) printf(X)
82 * The "pr_debug()" and "pr_devel()" macros should produce zero code
83 * unless DEBUG is defined:
86 #define pr_debug(fmt, ...) \
87 log(LOG_DEBUG, fmt, ##__VA_ARGS__)
88 #define pr_devel(fmt, ...) \
89 log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__)
91 #define pr_debug(fmt, ...) \
92 ({ if (0) log(LOG_DEBUG, fmt, ##__VA_ARGS__); 0; })
93 #define pr_devel(fmt, ...) \
94 ({ if (0) log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__); 0; })
98 #define pr_fmt(fmt) fmt
102 * Print a one-time message (analogous to WARN_ONCE() et al):
104 #define printk_once(...) do { \
105 static bool __print_once; \
107 if (!__print_once) { \
108 __print_once = true; \
109 printk(__VA_ARGS__); \
114 * Log a one-time message (analogous to WARN_ONCE() et al):
116 #define log_once(level,...) do { \
117 static bool __log_once; \
121 log(level, __VA_ARGS__); \
125 #define pr_emerg(fmt, ...) \
126 log(LOG_EMERG, pr_fmt(fmt), ##__VA_ARGS__)
127 #define pr_alert(fmt, ...) \
128 log(LOG_ALERT, pr_fmt(fmt), ##__VA_ARGS__)
129 #define pr_crit(fmt, ...) \
130 log(LOG_CRIT, pr_fmt(fmt), ##__VA_ARGS__)
131 #define pr_err(fmt, ...) \
132 log(LOG_ERR, pr_fmt(fmt), ##__VA_ARGS__)
133 #define pr_warning(fmt, ...) \
134 log(LOG_WARNING, pr_fmt(fmt), ##__VA_ARGS__)
135 #define pr_warn pr_warning
136 #define pr_notice(fmt, ...) \
137 log(LOG_NOTICE, pr_fmt(fmt), ##__VA_ARGS__)
138 #define pr_info(fmt, ...) \
139 log(LOG_INFO, pr_fmt(fmt), ##__VA_ARGS__)
140 #define pr_info_once(fmt, ...) \
141 log_once(LOG_INFO, pr_fmt(fmt), ##__VA_ARGS__)
142 #define pr_cont(fmt, ...) \
143 printk(KERN_CONT fmt, ##__VA_ARGS__)
146 #define WARN(condition, format...) ({ \
147 int __ret_warn_on = !!(condition); \
148 if (unlikely(__ret_warn_on)) \
149 pr_warning(format); \
150 unlikely(__ret_warn_on); \
154 #define container_of(ptr, type, member) \
156 __typeof(((type *)0)->member) *_p = (ptr); \
157 (type *)((char *)_p - offsetof(type, member)); \
160 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
162 #define simple_strtoul(...) strtoul(__VA_ARGS__)
163 #define simple_strtol(...) strtol(__VA_ARGS__)
164 #define kstrtol(a,b,c) ({*(c) = strtol(a,0,b); 0;})
165 #define kstrtoint(a,b,c) ({*(c) = strtol(a,0,b); 0;})
166 #define kstrtouint(a,b,c) ({*(c) = strtol(a,0,b); 0;})
168 #define min(x, y) ((x) < (y) ? (x) : (y))
169 #define max(x, y) ((x) > (y) ? (x) : (y))
171 #define min3(a, b, c) min(a, min(b,c))
172 #define max3(a, b, c) max(a, max(b,c))
174 #define min_t(type, _x, _y) ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y))
175 #define max_t(type, _x, _y) ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y))
177 #define clamp_t(type, _x, min, max) min_t(type, max_t(type, _x, min), max)
178 #define clamp(x, lo, hi) min( max(x,lo), hi)
181 * This looks more complex than it should be. But we need to
182 * get the type for the ~ right in round_down (it needs to be
183 * as wide as the result!), and we want to evaluate the macro
184 * arguments just once each.
186 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
187 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
188 #define round_down(x, y) ((x) & ~__round_mask(x, y))
190 #define smp_processor_id() PCPU_GET(cpuid)
191 #define num_possible_cpus() mp_ncpus
192 #define num_online_cpus() mp_ncpus
194 typedef struct pm_message {
198 /* Swap values of a and b */
199 #define swap(a, b) do { \
200 typeof(a) _swap_tmp = a; \
205 #define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) / 2)) / (divisor))
207 static inline uintmax_t
208 mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
210 uintmax_t q = (x / divisor);
211 uintmax_t r = (x % divisor);
213 return ((q * multiplier) + ((r * multiplier) / divisor));
216 static inline int64_t
219 return (x < 0 ? -x : x);
222 #endif /* _LINUX_KERNEL_H_ */