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