kernel.h

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#ifndef PERF_LINUX_KERNEL_H_
#define PERF_LINUX_KERNEL_H_

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))

#define PERF_ALIGN(x, a)    __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
#define __PERF_ALIGN_MASK(x, mask)  (((x)+(mask))&~(mask))

#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif

#ifndef container_of

#define container_of(ptr, type, member) ({          \
    const typeof(((type *)0)->member) * __mptr = (ptr); \
    (type *)((char *)__mptr - offsetof(type, member)); })
#endif

#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))

#ifndef max
#define max(x, y) ({                \
    typeof(x) _max1 = (x);          \
    typeof(y) _max2 = (y);          \
    (void) (&_max1 == &_max2);      \
    _max1 > _max2 ? _max1 : _max2; })
#endif

#ifndef min
#define min(x, y) ({                \
    typeof(x) _min1 = (x);          \
    typeof(y) _min2 = (y);          \
    (void) (&_min1 == &_min2);      \
    _min1 < _min2 ? _min1 : _min2; })
#endif

#ifndef roundup
#define roundup(x, y) (                                \
{                                                      \
    const typeof(y) __y = y;               \
    (((x) + (__y - 1)) / __y) * __y;           \
}                                                      \
)
#endif

#ifndef BUG_ON
#ifdef NDEBUG
#define BUG_ON(cond) do { if (cond) {} } while (0)
#else
#define BUG_ON(cond) assert(!(cond))
#endif
#endif

/*
 * Both need more care to handle endianness
 * (Don't use bitmap_copy_le() for now)
 */
#define cpu_to_le64(x)  (x)
#define cpu_to_le32(x)  (x)

static inline int
vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
    int i;
    ssize_t ssize = size;

    i = vsnprintf(buf, size, fmt, args);

    return (i >= ssize) ? (ssize - 1) : i;
}

static inline int scnprintf(char * buf, size_t size, const char * fmt, ...)
{
    va_list args;
    ssize_t ssize = size;
    int i;

    va_start(args, fmt);
    i = vsnprintf(buf, size, fmt, args);
    va_end(args);

    return (i >= ssize) ? (ssize - 1) : i;
}

static inline unsigned long
simple_strtoul(const char *nptr, char **endptr, int base)
{
    return strtoul(nptr, endptr, base);
}

int eprintf(int level,
        const char *fmt, ...) __attribute__((format(printf, 2, 3)));

#ifndef pr_fmt
#define pr_fmt(fmt) fmt
#endif

#define pr_err(fmt, ...) \
    eprintf(0, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warning(fmt, ...) \
    eprintf(0, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_info(fmt, ...) \
    eprintf(0, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug(fmt, ...) \
    eprintf(1, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debugN(n, fmt, ...) \
    eprintf(n, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug3(fmt, ...) pr_debugN(3, pr_fmt(fmt), ##__VA_ARGS__)
#define pr_debug4(fmt, ...) pr_debugN(4, pr_fmt(fmt), ##__VA_ARGS__)

/*
 * This looks more complex than it should be. But we need to
 * get the type for the ~ right in round_down (it needs to be
 * as wide as the result!), and we want to evaluate the macro
 * arguments just once each.
 */
#define __round_mask(x, y) ((__typeof__(x))((y)-1))
#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
#define round_down(x, y) ((x) & ~__round_mask(x, y))

#endif