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 _RET_IP_ ((unsigned long)__builtin_return_address(0)) 18 19 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 20 21 #define PERF_ALIGN(x, a) __PERF_ALIGN_MASK(x, (typeof(x))(a)-1) 22 #define __PERF_ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) 23 24 #ifndef offsetof 25 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 26 #endif 27 28 #ifndef container_of 29 /** 30 * container_of - cast a member of a structure out to the containing structure 31 * @ptr: the pointer to the member. 32 * @type: the type of the container struct this is embedded in. 33 * @member: the name of the member within the struct. 34 * 35 */ 36 #define container_of(ptr, type, member) ({ \ 37 const typeof(((type *)0)->member) * __mptr = (ptr); \ 38 (type *)((char *)__mptr - offsetof(type, member)); }) 39 #endif 40 41 #ifndef max 42 #define max(x, y) ({ \ 43 typeof(x) _max1 = (x); \ 44 typeof(y) _max2 = (y); \ 45 (void) (&_max1 == &_max2); \ 46 _max1 > _max2 ? _max1 : _max2; }) 47 #endif 48 49 #ifndef min 50 #define min(x, y) ({ \ 51 typeof(x) _min1 = (x); \ 52 typeof(y) _min2 = (y); \ 53 (void) (&_min1 == &_min2); \ 54 _min1 < _min2 ? _min1 : _min2; }) 55 #endif 56 57 #define max_t(type, x, y) max((type)x, (type)y) 58 #define min_t(type, x, y) min((type)x, (type)y) 59 #define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi) 60 61 #ifndef roundup 62 #define roundup(x, y) ( \ 63 { \ 64 const typeof(y) __y = y; \ 65 (((x) + (__y - 1)) / __y) * __y; \ 66 } \ 67 ) 68 #endif 69 70 #ifndef BUG_ON 71 #ifdef NDEBUG 72 #define BUG_ON(cond) do { if (cond) {} } while (0) 73 #else 74 #define BUG_ON(cond) assert(!(cond)) 75 #endif 76 #endif 77 #define BUG() BUG_ON(1) 78 79 #if __BYTE_ORDER == __BIG_ENDIAN 80 #define cpu_to_le16 bswap_16 81 #define cpu_to_le32 bswap_32 82 #define cpu_to_le64 bswap_64 83 #define le16_to_cpu bswap_16 84 #define le32_to_cpu bswap_32 85 #define le64_to_cpu bswap_64 86 #define cpu_to_be16 87 #define cpu_to_be32 88 #define cpu_to_be64 89 #define be16_to_cpu 90 #define be32_to_cpu 91 #define be64_to_cpu 92 #else 93 #define cpu_to_le16 94 #define cpu_to_le32 95 #define cpu_to_le64 96 #define le16_to_cpu 97 #define le32_to_cpu 98 #define le64_to_cpu 99 #define cpu_to_be16 bswap_16 100 #define cpu_to_be32 bswap_32 101 #define cpu_to_be64 bswap_64 102 #define be16_to_cpu bswap_16 103 #define be32_to_cpu bswap_32 104 #define be64_to_cpu bswap_64 105 #endif 106 107 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); 108 int scnprintf(char * buf, size_t size, const char * fmt, ...); 109 int scnprintf_pad(char * buf, size_t size, const char * fmt, ...); 110 111 #ifndef ARRAY_SIZE 112 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 113 #endif 114 115 /* 116 * This looks more complex than it should be. But we need to 117 * get the type for the ~ right in round_down (it needs to be 118 * as wide as the result!), and we want to evaluate the macro 119 * arguments just once each. 120 */ 121 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 122 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 123 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 124 125 #define current_gfp_context(k) 0 126 #define synchronize_rcu() 127 128 #endif 129