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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-08-21 20:11:11 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-08-21 20:11:11 +0000
commit62a6e3e19a35e19a66abe6eec66005defac06d7c (patch)
treebd76194f73da039757d66fbd9e9c3561d9b3d097 /osdep.h
parentbcfad70fb0189ba4aca8661e46de95e7149009c6 (diff)
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
Diffstat (limited to 'osdep.h')
-rw-r--r--osdep.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/osdep.h b/osdep.h
index 6312e7a2e4..09ebace5b3 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