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@xxxxxxxxxxxxxxxxxx>
---
include/linux/vfio.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
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 @@ extern void vfio_unregister_iommu_driver(
* 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
--
1.8.3.2
--
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