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/compiler.h> 9 #include <endian.h> 10 #include <byteswap.h> 11 12 #ifndef UINT_MAX 13 #define UINT_MAX (~0U) 14 #endif 15 16 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 17 18 #define PERF_ALIGN(x, a) __PERF_ALIGN_MASK(x, (typeof(x))(a)-1) 19 #define __PERF_ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) 20 21 #ifndef offsetof 22 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) 23 #endif 24 25 #ifndef container_of 26 /** 27 * container_of - cast a member of a structure out to the containing structure 28 * @ptr: the pointer to the member. 29 * @type: the type of the container struct this is embedded in. 30 * @member: the name of the member within the struct. 31 * 32 */ 33 #define container_of(ptr, type, member) ({ \ 34 const typeof(((type *)0)->member) * __mptr = (ptr); \ 35 (type *)((char *)__mptr - offsetof(type, member)); }) 36 #endif 37 38 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 39 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) 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 #ifndef roundup 58 #define roundup(x, y) ( \ 59 { \ 60 const typeof(y) __y = y; \ 61 (((x) + (__y - 1)) / __y) * __y; \ 62 } \ 63 ) 64 #endif 65 66 #ifndef BUG_ON 67 #ifdef NDEBUG 68 #define BUG_ON(cond) do { if (cond) {} } while (0) 69 #else 70 #define BUG_ON(cond) assert(!(cond)) 71 #endif 72 #endif 73 #define BUG() BUG_ON(1) 74 75 #if __BYTE_ORDER == __BIG_ENDIAN 76 #define cpu_to_le16 bswap_16 77 #define cpu_to_le32 bswap_32 78 #define cpu_to_le64 bswap_64 79 #define le16_to_cpu bswap_16 80 #define le32_to_cpu bswap_32 81 #define le64_to_cpu bswap_64 82 #define cpu_to_be16 83 #define cpu_to_be32 84 #define cpu_to_be64 85 #define be16_to_cpu 86 #define be32_to_cpu 87 #define be64_to_cpu 88 #else 89 #define cpu_to_le16 90 #define cpu_to_le32 91 #define cpu_to_le64 92 #define le16_to_cpu 93 #define le32_to_cpu 94 #define le64_to_cpu 95 #define cpu_to_be16 bswap_16 96 #define cpu_to_be32 bswap_32 97 #define cpu_to_be64 bswap_64 98 #define be16_to_cpu bswap_16 99 #define be32_to_cpu bswap_32 100 #define be64_to_cpu bswap_64 101 #endif 102 103 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args); 104 int scnprintf(char * buf, size_t size, const char * fmt, ...); 105 int scnprintf_pad(char * buf, size_t size, const char * fmt, ...); 106 107 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 108 109 /* 110 * This looks more complex than it should be. But we need to 111 * get the type for the ~ right in round_down (it needs to be 112 * as wide as the result!), and we want to evaluate the macro 113 * arguments just once each. 114 */ 115 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 116 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 117 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 118 119 #define current_gfp_context(k) 0 120 #define synchronize_rcu() 121 122 #endif 123