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Get rid of aligment warning on CONTAINER_OF in clang

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Nils O. Selåsdal
2013-06-27 20:58:43 +02:00
parent a8dcf6edff
commit 1e0e840ee5
1 changed files with 4 additions and 2 deletions
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include/ucore/utils.h
+4 -2
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@@ -48,12 +48,14 @@
//struct foo *f = CONTAINER_OF(p, struct foo, zap);
#define CONTAINER_OF(ptr, type, member) ({ \
typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (unsigned char *)__mptr - offsetof(type, member) ); })
(type *)((void *)(unsigned char *)__mptr - offsetof(type, member) ); })
//the void* cast is to suppress alignment warnings
//Same as CONTAINER_OF, but for a const pointer to avoid gcc warnings..
#define CONST_CONTAINER_OF(ptr, type, member) ({ \
const typeof( ((const type *)0)->member ) *__mptr = (ptr); \
(const type *)( (const unsigned char *)__mptr - offsetof(const type, member) ); })
(const type *)((const void *)(const unsigned char *)__mptr - offsetof(const type, member) ); })
/** Align a value.
* @param val value to align