1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __TOOLS_LINUX_KERNEL_H
3 #define __TOOLS_LINUX_KERNEL_H
8 #include <linux/build_bug.h>
9 #include <linux/compiler.h>
14 #define UINT_MAX (~0U)
17 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
19 #define PERF_ALIGN(x, a) __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
20 #define __PERF_ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
23 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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.
34 #define container_of(ptr, type, member) ({ \
35 const typeof(((type *)0)->member) * __mptr = (ptr); \
36 (type *)((char *)__mptr - offsetof(type, member)); })
40 #define max(x, y) ({ \
41 typeof(x) _max1 = (x); \
42 typeof(y) _max2 = (y); \
43 (void) (&_max1 == &_max2); \
44 _max1 > _max2 ? _max1 : _max2; })
48 #define min(x, y) ({ \
49 typeof(x) _min1 = (x); \
50 typeof(y) _min2 = (y); \
51 (void) (&_min1 == &_min2); \
52 _min1 < _min2 ? _min1 : _min2; })
56 #define roundup(x, y) ( \
58 const typeof(y) __y = y; \
59 (((x) + (__y - 1)) / __y) * __y; \
66 #define BUG_ON(cond) do { if (cond) {} } while (0)
68 #define BUG_ON(cond) assert(!(cond))
71 #define BUG() BUG_ON(1)
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
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
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, ...);
105 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
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.
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))
117 #define current_gfp_context(k) 0
118 #define synchronize_rcu()