add container_of() macro to osdep.h (Gerd Hoffmann)
From linux kernel sources, xen bits will use it, put it
into a place where others can see and use it too ;)
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5057 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/osdep.h b/osdep.h
index 6312e7a..09ebace 100644
--- a/osdep.h
+++ b/osdep.h
@@ -23,6 +23,10 @@
#define unlikely(x) __builtin_expect(!!(x), 0)
#endif
+#define container_of(ptr, type, member) ({ \
+ const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+ (type *)( (char *)__mptr - offsetof(type,member) );})
+
#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
