1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __TOOLS_LINUX_KERNEL_H 3 #define __TOOLS_LINUX_KERNEL_H 4 5 #include <stdarg.h> 6 #include <stddef.h> 7 #include <assert.h> 8 #include <linux/build_bug.h> 9 #include <linux/compiler.h> 10 #include <endian.h> 11 #include <byteswap.h> 12 13 #ifndef UINT_MAX 14 #define UINT_MAX (~0U) 15 #endif 16 17 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 18 19 #define PERF_ALIGN(x, a) __PERF_ALIGN_MASK(x, (typeof(x))(a)-1) 20 #define __PERF_ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) 21 22 #ifndef offsetof 23 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 24 #endif 25 26 #ifndef container_of 27 /** 28 * container_of - cast a member of a structure out to the containing structure 29 * @ptr: the pointer to the member. 30 * @type: the type of the container struct this is embedded in. 31 * @member: the name of the member within the struct. 32 * 33 */ 34 #define container_of(ptr, type, member) ({ \ 35 const typeof(((type *)0)->member) * __mptr = (ptr); \ 36 (type *)((char *)__mptr - offsetof(type, member)); }) 37 #endif 38 39 #ifndef max 40 #define max(x, y) ({ \ 41 typeof(x) _max1 = (x); \ 42 typeof(y) _max2 = (y); \ 43 (void) (&_max1 == &_max2); \ 44 _max1 > _max2 ? _max1 : _max2; }) 45 #endif 46 47 #ifndef min 48 #define min(x, y) ({ \ 49 typeof(x) _min1 = (x); \ 50 typeof(y) _min2 = (y); \ 51 (void) (&_min1 == &_min2); \ 52 _min1 < _min2 ? _min1 : _min2; }) 53 #endif 54 55 #ifndef roundup 56 #define roundup(x, y) ( \ 57 { \ 58 const typeof(y) __y = y; \ 59 (((x) + (__y - 1)) / __y) * __y; \ 60 } \ 61 ) 62 #endif 63 64 #ifndef BUG_ON 65 #ifdef NDEBUG 66 #define BUG_ON(cond) do { if (cond) {} } while (0) 67 #else 68 #define BUG_ON(cond) assert(!(cond)) 69 #endif 70 #endif 71 #define BUG() BUG_ON(1) 72 73 #if __BYTE_ORDER == __BIG_ENDIAN 74 #define cpu_to_le16 bswap_16 75 #define cpu_to_le32 bswap_32 76 #define cpu_to_le64 bswap_64 77 #define le16_to_cpu bswap_16 78 #define le32_to_cpu bswap_32 79 #define le64_to_cpu bswap_64 80 #define cpu_to_be16 81 #define cpu_to_be32 82 #define cpu_to_be64 83 #define be16_to_cpu 84 #define be32_to_cpu 85 #define be64_to_cpu 86 #else 87 #define cpu_to_le16 88 #define cpu_to_le32 89 #define cpu_to_le64 90 #define le16_to_cpu 91 #define le32_to_cpu 92 #define le64_to_cpu 93 #define cpu_to_be16 bswap_16 94 #define cpu_to_be32 bswap_32 95 #define cpu_to_be64 bswap_64 96 #define be16_to_cpu bswap_16 97 #define be32_to_cpu bswap_32 98 #define be64_to_cpu bswap_64 99 #endif 100 101 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); 102 int scnprintf(char * buf, size_t size, const char * fmt, ...); 103 int scnprintf_pad(char * buf, size_t size, const char * fmt, ...); 104 105 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 106 107 /* 108 * This looks more complex than it should be. But we need to 109 * get the type for the ~ right in round_down (it needs to be 110 * as wide as the result!), and we want to evaluate the macro 111 * arguments just once each. 112 */ 113 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 114 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 115 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 116 117 #define current_gfp_context(k) 0 118 #define synchronize_rcu() 119 120 #endif 121