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add a simple Makefile to build and clean up

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add missing macros, static inline functions, etc.
add README to illustrate the purpose of this repo.

Signed-off-by: Yonghong Song <yhs@fb.com>
This commit is contained in:
Yonghong Song
2018-10-09 21:45:49 -07:00
parent 66684189f0
commit 8acf2635c3
8 changed files with 189 additions and 150 deletions
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37
include/linux/kernel.h
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@@ -3,10 +3,41 @@
#ifndef __LINUX_KERNEL_H
#define __LINUX_KERNEL_H
#ifndef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#define container_of(ptr, type, member) ({ \
const typeof(((type *)0)->member) * __mptr = (ptr); \
(type *)((char *)__mptr - offsetof(type, member)); })
#ifndef container_of
#define container_of(ptr, type, member) ({ \
const typeof(((type *)0)->member) * __mptr = (ptr); \
(type *)((char *)__mptr - offsetof(type, member)); })
#endif
#ifndef max
#define max(x, y) ({ \
typeof(x) _max1 = (x); \
typeof(y) _max2 = (y); \
(void) (&_max1 == &_max2); \
_max1 > _max2 ? _max1 : _max2; })
#endif
#ifndef min
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \
(void) (&_min1 == &_min2); \
_min1 < _min2 ? _min1 : _min2; })
#endif
#ifndef roundup
#define roundup(x, y) ( \
{ \
const typeof(y) __y = y; \
(((x) + (__y - 1)) / __y) * __y; \
} \
)
#endif
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#endif