tools/perf/util/include/linux/kernel.h

   1 #ifndef PERF_LINUX_KERNEL_H_
   2 #define PERF_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
  73 static inline int
  74 vscnprintf(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
  84 static 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 int eprintf(int level,
  98             const char *fmt, ...) __attribute__((format(printf, 2, 3)));
  99
 100 #ifndef pr_fmt
 101 #define pr_fmt(fmt) fmt
 102 #endif
 103
 104 #define pr_err(fmt, ...) \
 105         eprintf(0, pr_fmt(fmt), ##__VA_ARGS__)
 106 #define pr_warning(fmt, ...) \
 107         eprintf(0, pr_fmt(fmt), ##__VA_ARGS__)
 108 #define pr_info(fmt, ...) \
 109         eprintf(0, pr_fmt(fmt), ##__VA_ARGS__)
 110 #define pr_debug(fmt, ...) \
 111         eprintf(1, pr_fmt(fmt), ##__VA_ARGS__)
 112 #define pr_debugN(n, fmt, ...) \
 113         eprintf(n, pr_fmt(fmt), ##__VA_ARGS__)
 114 #define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
 115 #define pr_debug3(fmt, ...) pr_debugN(3, pr_fmt(fmt), ##__VA_ARGS__)
 116 #define pr_debug4(fmt, ...) pr_debugN(4, pr_fmt(fmt), ##__VA_ARGS__)
 117
 118 /*
 119  * This looks more complex than it should be. But we need to
 120  * get the type for the ~ right in round_down (it needs to be
 121  * as wide as the result!), and we want to evaluate the macro
 122  * arguments just once each.
 123  */
 124 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
 125 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 126 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 127
 128 #endif