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