From 5096fae3fdabc889545ecae508e3dbd0579fcbc9 Mon Sep 17 00:00:00 2001
From: Mark McLoughlin <markmc@redhat.com>
Date: Wed, 25 Nov 2009 18:49:03 +0000
Subject: qdev: move DO_UPCAST() into osdep.h

Nothing qdev specific about this, make it available throughtout.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 osdep.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'osdep.h')

diff --git a/osdep.h b/osdep.h
index 4b4aad4d49..75b581630f 100644
--- a/osdep.h
+++ b/osdep.h
@@ -37,6 +37,16 @@
         (type *) ((char *) __mptr - offsetof(type, member));})
 #endif
 
+/* Convert from a base type to a parent type, with compile time checking.  */
+#ifdef __GNUC__
+#define DO_UPCAST(type, field, dev) ( __extension__ ( { \
+    char __attribute__((unused)) offset_must_be_zero[ \
+        -offsetof(type, field)]; \
+    container_of(dev, type, field);}))
+#else
+#define DO_UPCAST(type, field, dev) container_of(dev, type, field)
+#endif
+
 #define typeof_field(type, field) typeof(((type *)0)->field)
 #define type_check(t1,t2) ((t1*)0 - (t2*)0)
 
-- 
cgit v1.2.1