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container_of() reimplemented.

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This commit is contained in:
Bahadir Balban
2009-06-08 14:35:12 +03:00
parent 276b4643c6
commit f285337bba
1 changed files with 5 additions and 17 deletions
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22
include/l4/macros.h
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@@ -53,24 +53,12 @@
#ifndef __ASSEMBLY__
#include <stddef.h> /* offsetof macro, defined in the `standard' way. */
#endif
/* Offset of struct fields. */
//#if (__GNUC__ >= 4)
//#define offsetof(type, field) __builtin_offsetof(type, field)
//#else
//#define offsetof(type, field) (u32)(&((type *)0)->field)
//#endif
/* LICENSE: Taken off Linux */
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
*/
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#define container_of(ptr, struct_type, field) \
({ \
const typeof(((struct_type *)0)->field) *field_ptr = (ptr); \
(struct_type *)((char *)field_ptr - offsetof(struct_type, field)); \
})
/* Prefetching is noop for now */
#define prefetch(x) x