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/compiler.h>
   9#include <endian.h>
  10#include <byteswap.h>
  11
  12#ifndef UINT_MAX
  13#define UINT_MAX        (~0U)
  14#endif
  15
  16#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  17
  18#define PERF_ALIGN(x, a)        __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
  19#define __PERF_ALIGN_MASK(x, mask)      (((x)+(mask))&~(mask))
  20
  21#ifndef offsetof
  22#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  23#endif
  24
  25#ifndef container_of
  26/**
  27 * container_of - cast a member of a structure out to the containing structure
  28 * @ptr:        the pointer to the member.
  29 * @type:       the type of the container struct this is embedded in.
  30 * @member:     the name of the member within the struct.
  31 *
  32 */
  33#define container_of(ptr, type, member) ({                      \
  34        const typeof(((type *)0)->member) * __mptr = (ptr);     \
  35        (type *)((char *)__mptr - offsetof(type, member)); })
  36#endif
  37
  38#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  39#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
  40
  41#ifndef max
  42#define max(x, y) ({                            \
  43        typeof(x) _max1 = (x);                  \
  44        typeof(y) _max2 = (y);                  \
  45        (void) (&_max1 == &_max2);              \
  46        _max1 > _max2 ? _max1 : _max2; })
  47#endif
  48
  49#ifndef min
  50#define min(x, y) ({                            \
  51        typeof(x) _min1 = (x);                  \
  52        typeof(y) _min2 = (y);                  \
  53        (void) (&_min1 == &_min2);              \
  54        _min1 < _min2 ? _min1 : _min2; })
  55#endif
  56
  57#ifndef roundup
  58#define roundup(x, y) (                                \
  59{                                                      \
  60        const typeof(y) __y = y;                       \
  61        (((x) + (__y - 1)) / __y) * __y;               \
  62}                                                      \
  63)
  64#endif
  65
  66#ifndef BUG_ON
  67#ifdef NDEBUG
  68#define BUG_ON(cond) do { if (cond) {} } while (0)
  69#else
  70#define BUG_ON(cond) assert(!(cond))
  71#endif
  72#endif
  73#define BUG()   BUG_ON(1)
  74
  75#if __BYTE_ORDER == __BIG_ENDIAN
  76#define cpu_to_le16 bswap_16
  77#define cpu_to_le32 bswap_32
  78#define cpu_to_le64 bswap_64
  79#define le16_to_cpu bswap_16
  80#define le32_to_cpu bswap_32
  81#define le64_to_cpu bswap_64
  82#define cpu_to_be16
  83#define cpu_to_be32
  84#define cpu_to_be64
  85#define be16_to_cpu
  86#define be32_to_cpu
  87#define be64_to_cpu
  88#else
  89#define cpu_to_le16
  90#define cpu_to_le32
  91#define cpu_to_le64
  92#define le16_to_cpu
  93#define le32_to_cpu
  94#define le64_to_cpu
  95#define cpu_to_be16 bswap_16
  96#define cpu_to_be32 bswap_32
  97#define cpu_to_be64 bswap_64
  98#define be16_to_cpu bswap_16
  99#define be32_to_cpu bswap_32
 100#define be64_to_cpu bswap_64
 101#endif
 102
 103int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
 104int scnprintf(char * buf, size_t size, const char * fmt, ...);
 105int scnprintf_pad(char * buf, size_t size, const char * fmt, ...);
 106
 107#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 108
 109/*
 110 * This looks more complex than it should be. But we need to
 111 * get the type for the ~ right in round_down (it needs to be
 112 * as wide as the result!), and we want to evaluate the macro
 113 * arguments just once each.
 114 */
 115#define __round_mask(x, y) ((__typeof__(x))((y)-1))
 116#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 117#define round_down(x, y) ((x) & ~__round_mask(x, y))
 118
 119#define current_gfp_context(k) 0
 120#define synchronize_rcu()
 121
 122#endif
 123