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authorGavin Shan <gwshan@linux.vnet.ibm.com>2014-05-30 21:35:54 +0400
committerAlex Williamson <alex.williamson@redhat.com>2014-05-30 21:35:54 +0400
commitb13460b92093b29347e99d6c3242e350052b62cd (patch)
tree53950c28dd2468d9a6654edc1c4e837c9b33c391 /include/linux/vfio.h
parentc8dbca165bb090f926996a572ea2b5b577b34b70 (diff)
downloadlinux-b13460b92093b29347e99d6c3242e350052b62cd.tar.xz
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>
Diffstat (limited to 'include/linux/vfio.h')
-rw-r--r--include/linux/vfio.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 81022a52bc34..8ec980b5e3af 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