tools/include/linux/kernel.h

   1 #ifndef __TOOLS_LINUX_KERNEL_H
   2 #define __TOOLS_LINUX_KERNEL_H
   3
   4 #include <stdarg.h>
   5 #include <stddef.h>
   6 #include <assert.h>
   7 #include <linux/compiler.h>
   8
   9 #ifndef UINT_MAX
  10 #define UINT_MAX        (~0U)
  11 #endif
  12
  13 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  14
  15 #define PERF_ALIGN(x, a)        __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
  16 #define __PERF_ALIGN_MASK(x, mask)      (((x)+(mask))&~(mask))
  17
  18 #ifndef offsetof
  19 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  20 #endif
  21
  22 #ifndef container_of
  23 /**
  24  * container_of - cast a member of a structure out to the containing structure
  25  * @ptr:        the pointer to the member.
  26  * @type:       the type of the container struct this is embedded in.
  27  * @member:     the name of the member within the struct.
  28  *
  29  */
  30 #define container_of(ptr, type, member) ({                      \
  31         const typeof(((type *)0)->member) * __mptr = (ptr);     \
  32         (type *)((char *)__mptr - offsetof(type, member)); })
  33 #endif
  34
  35 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
  36
  37 #ifndef max
  38 #define max(x, y) ({                            \
  39         typeof(x) _max1 = (x);                  \
  40         typeof(y) _max2 = (y);                  \
  41         (void) (&_max1 == &_max2);              \
  42         _max1 > _max2 ? _max1 : _max2; })
  43 #endif
  44
  45 #ifndef min
  46 #define min(x, y) ({                            \
  47         typeof(x) _min1 = (x);                  \
  48         typeof(y) _min2 = (y);                  \
  49         (void) (&_min1 == &_min2);              \
  50         _min1 < _min2 ? _min1 : _min2; })
  51 #endif
  52
  53 #ifndef roundup
  54 #define roundup(x, y) (                                \
  55 {                                                      \
  56         const typeof(y) __y = y;                       \
  57         (((x) + (__y - 1)) / __y) * __y;               \
  58 }                                                      \
  59 )
  60 #endif
  61
  62 #ifndef BUG_ON
  63 #ifdef NDEBUG
  64 #define BUG_ON(cond) do { if (cond) {} } while (0)
  65 #else
  66 #define BUG_ON(cond) assert(!(cond))
  67 #endif
  68 #endif
  69
  70 /*
  71  * Both need more care to handle endianness
  72  * (Don't use bitmap_copy_le() for now)
  73  */
  74 #define cpu_to_le64(x)  (x)
  75 #define cpu_to_le32(x)  (x)
  76
  77 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
  78 int scnprintf(char * buf, size_t size, const char * fmt, ...);
  79
  80 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
  81
  82 /*
  83  * This looks more complex than it should be. But we need to
  84  * get the type for the ~ right in round_down (it needs to be
  85  * as wide as the result!), and we want to evaluate the macro
  86  * arguments just once each.
  87  */
  88 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
  89 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
  90 #define round_down(x, y) ((x) & ~__round_mask(x, y))
  91
  92 #endif