1 #ifndef __TOOLS_LINUX_KERNEL_H
2 #define __TOOLS_LINUX_KERNEL_H
8 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
10 #define PERF_ALIGN(x, a) __PERF_ALIGN_MASK(x, (typeof(x))(a)-1)
11 #define __PERF_ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
14 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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.
25 #define container_of(ptr, type, member) ({ \
26 const typeof(((type *)0)->member) * __mptr = (ptr); \
27 (type *)((char *)__mptr - offsetof(type, member)); })
30 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
33 #define max(x, y) ({ \
34 typeof(x) _max1 = (x); \
35 typeof(y) _max2 = (y); \
36 (void) (&_max1 == &_max2); \
37 _max1 > _max2 ? _max1 : _max2; })
41 #define min(x, y) ({ \
42 typeof(x) _min1 = (x); \
43 typeof(y) _min2 = (y); \
44 (void) (&_min1 == &_min2); \
45 _min1 < _min2 ? _min1 : _min2; })
49 #define roundup(x, y) ( \
51 const typeof(y) __y = y; \
52 (((x) + (__y - 1)) / __y) * __y; \
59 #define BUG_ON(cond) do { if (cond) {} } while (0)
61 #define BUG_ON(cond) assert(!(cond))
66 * Both need more care to handle endianness
67 * (Don't use bitmap_copy_le() for now)
69 #define cpu_to_le64(x) (x)
70 #define cpu_to_le32(x) (x)
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, ...);
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.
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))