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