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
  74 #if __BYTE_ORDER == __BIG_ENDIAN
  75 #define cpu_to_le16 bswap_16
  76 #define cpu_to_le32 bswap_32
  77 #define cpu_to_le64 bswap_64
  78 #define le16_to_cpu bswap_16
  79 #define le32_to_cpu bswap_32
  80 #define le64_to_cpu bswap_64
  81 #define cpu_to_be16
  82 #define cpu_to_be32
  83 #define cpu_to_be64
  84 #define be16_to_cpu
  85 #define be32_to_cpu
  86 #define be64_to_cpu
  87 #else
  88 #define cpu_to_le16
  89 #define cpu_to_le32
  90 #define cpu_to_le64
  91 #define le16_to_cpu
  92 #define le32_to_cpu
  93 #define le64_to_cpu
  94 #define cpu_to_be16 bswap_16
  95 #define cpu_to_be32 bswap_32
  96 #define cpu_to_be64 bswap_64
  97 #define be16_to_cpu bswap_16
  98 #define be32_to_cpu bswap_32
  99 #define be64_to_cpu bswap_64
 100 #endif
 101
 102 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
 103 int scnprintf(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_sched()
 119
 120 #endif