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