drivers/vfio: Rework offsetofend()
The macro offsetofend() introduces unnecessary temporary variable
"tmp". The patch avoids that and saves a bit memory in stack.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 81022a52..8ec980b 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -86,9 +86,8 @@
* from user space. This allows us to easily determine if the provided
* structure is sized to include various fields.
*/
-#define offsetofend(TYPE, MEMBER) ({ \
- TYPE tmp; \
- offsetof(TYPE, MEMBER) + sizeof(tmp.MEMBER); }) \
+#define offsetofend(TYPE, MEMBER) \
+ (offsetof(TYPE, MEMBER) + sizeof(((TYPE *)0)->MEMBER))
/*
* External user API