LXR linux/tools/include/linux/kernel.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __TOOLS_LINUX_KERNEL_H
   3#define __TOOLS_LINUX_KERNEL_H
   4
   5#include <stdarg.h>
   6#include <stddef.h>
   7#include <assert.h>
   8#include <linux/build_bug.h>
   9#include <linux/compiler.h>
  10#include <endian.h>
  11#include <byteswap.h>
  12
  13#ifndef UINT_MAX
  14#define UINT_MAX        (~0U)
  15#endif
  16
  17#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  18
  19#define PERF_ALIGN(x, a)        __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
  20#define __PERF_ALIGN_MASK(x, mask)      (((x)+(mask))&~(mask))
  21
  22#ifndef offsetof
  23#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  24#endif
  25
  26#ifndef container_of
  27/**
  28 * container_of - cast a member of a structure out to the containing structure
  29 * @ptr:        the pointer to the member.
  30 * @type:       the type of the container struct this is embedded in.
  31 * @member:     the name of the member within the struct.
  32 *
  33 */
  34#define container_of(ptr, type, member) ({                      \
  35        const typeof(((type *)0)->member) * __mptr = (ptr);     \
  36        (type *)((char *)__mptr - offsetof(type, member)); })
  37#endif
  38
  39#ifndef max
  40#define max(x, y) ({                            \
  41        typeof(x) _max1 = (x);                  \
  42        typeof(y) _max2 = (y);                  \
  43        (void) (&_max1 == &_max2);              \
  44        _max1 > _max2 ? _max1 : _max2; })
  45#endif
  46
  47#ifndef min
  48#define min(x, y) ({                            \
  49        typeof(x) _min1 = (x);                  \
  50        typeof(y) _min2 = (y);                  \
  51        (void) (&_min1 == &_min2);              \
  52        _min1 < _min2 ? _min1 : _min2; })
  53#endif
  54
  55#ifndef roundup
  56#define roundup(x, y) (                                \
  57{                                                      \
  58        const typeof(y) __y = y;                       \
  59        (((x) + (__y - 1)) / __y) * __y;               \
  60}                                                      \
  61)
  62#endif
  63
  64#ifndef BUG_ON
  65#ifdef NDEBUG
  66#define BUG_ON(cond) do { if (cond) {} } while (0)
  67#else
  68#define BUG_ON(cond) assert(!(cond))
  69#endif
  70#endif
  71#define BUG()   BUG_ON(1)
  72
  73#if __BYTE_ORDER == __BIG_ENDIAN
  74#define cpu_to_le16 bswap_16
  75#define cpu_to_le32 bswap_32
  76#define cpu_to_le64 bswap_64
  77#define le16_to_cpu bswap_16
  78#define le32_to_cpu bswap_32
  79#define le64_to_cpu bswap_64
  80#define cpu_to_be16
  81#define cpu_to_be32
  82#define cpu_to_be64
  83#define be16_to_cpu
  84#define be32_to_cpu
  85#define be64_to_cpu
  86#else
  87#define cpu_to_le16
  88#define cpu_to_le32
  89#define cpu_to_le64
  90#define le16_to_cpu
  91#define le32_to_cpu
  92#define le64_to_cpu
  93#define cpu_to_be16 bswap_16
  94#define cpu_to_be32 bswap_32
  95#define cpu_to_be64 bswap_64
  96#define be16_to_cpu bswap_16
  97#define be32_to_cpu bswap_32
  98#define be64_to_cpu bswap_64
  99#endif
 100
 101int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
 102int scnprintf(char * buf, size_t size, const char * fmt, ...);
 103int scnprintf_pad(char * buf, size_t size, const char * fmt, ...);
 104
 105#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 106
 107/*
 108 * This looks more complex than it should be. But we need to
 109 * get the type for the ~ right in round_down (it needs to be
 110 * as wide as the result!), and we want to evaluate the macro
 111 * arguments just once each.
 112 */
 113#define __round_mask(x, y) ((__typeof__(x))((y)-1))
 114#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 115#define round_down(x, y) ((x) & ~__round_mask(x, y))
 116
 117#define current_gfp_context(k) 0
 118#define synchronize_rcu()
 119
 120#endif
 121