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 <stdio.h>
   6#include <stdlib.h>
   7#include <assert.h>
   8
   9#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  10
  11#define PERF_ALIGN(x, a)        __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
  12#define __PERF_ALIGN_MASK(x, mask)      (((x)+(mask))&~(mask))
  13
  14#ifndef offsetof
  15#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
  16#endif
  17
  18#ifndef container_of
  19/**
  20 * container_of - cast a member of a structure out to the containing structure
  21 * @ptr:        the pointer to the member.
  22 * @type:       the type of the container struct this is embedded in.
  23 * @member:     the name of the member within the struct.
  24 *
  25 */
  26#define container_of(ptr, type, member) ({                      \
  27        const typeof(((type *)0)->member) * __mptr = (ptr);     \
  28        (type *)((char *)__mptr - offsetof(type, member)); })
  29#endif
  30
  31#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
  32
  33#ifndef max
  34#define max(x, y) ({                            \
  35        typeof(x) _max1 = (x);                  \
  36        typeof(y) _max2 = (y);                  \
  37        (void) (&_max1 == &_max2);              \
  38        _max1 > _max2 ? _max1 : _max2; })
  39#endif
  40
  41#ifndef min
  42#define min(x, y) ({                            \
  43        typeof(x) _min1 = (x);                  \
  44        typeof(y) _min2 = (y);                  \
  45        (void) (&_min1 == &_min2);              \
  46        _min1 < _min2 ? _min1 : _min2; })
  47#endif
  48
  49#ifndef roundup
  50#define roundup(x, y) (                                \
  51{                                                      \
  52        const typeof(y) __y = y;                       \
  53        (((x) + (__y - 1)) / __y) * __y;               \
  54}                                                      \
  55)
  56#endif
  57
  58#ifndef BUG_ON
  59#ifdef NDEBUG
  60#define BUG_ON(cond) do { if (cond) {} } while (0)
  61#else
  62#define BUG_ON(cond) assert(!(cond))
  63#endif
  64#endif
  65
  66/*
  67 * Both need more care to handle endianness
  68 * (Don't use bitmap_copy_le() for now)
  69 */
  70#define cpu_to_le64(x)  (x)
  71#define cpu_to_le32(x)  (x)
  72
  73static inline int
  74vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
  75{
  76        int i;
  77        ssize_t ssize = size;
  78
  79        i = vsnprintf(buf, size, fmt, args);
  80
  81        return (i >= ssize) ? (ssize - 1) : i;
  82}
  83
  84static inline int scnprintf(char * buf, size_t size, const char * fmt, ...)
  85{
  86        va_list args;
  87        ssize_t ssize = size;
  88        int i;
  89
  90        va_start(args, fmt);
  91        i = vsnprintf(buf, size, fmt, args);
  92        va_end(args);
  93
  94        return (i >= ssize) ? (ssize - 1) : i;
  95}
  96
  97/*
  98 * This looks more complex than it should be. But we need to
  99 * get the type for the ~ right in round_down (it needs to be
 100 * as wide as the result!), and we want to evaluate the macro
 101 * arguments just once each.
 102 */
 103#define __round_mask(x, y) ((__typeof__(x))((y)-1))
 104#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 105#define round_down(x, y) ((x) & ~__round_mask(x, y))
 106
 107#endif
 108