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