From d712806b39d0c92082eba336fcfd9ea7708283f3 Mon Sep 17 00:00:00 2001
From: Marc Hartmayer <mhartmay@linux.ibm.com>
Date: Wed, 7 Sep 2022 10:18:44 +0000
Subject: [PATCH] lib/zt_common.h: add macro for determining field size
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The macro `sizeof_field` is used in the next patch.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
---
 include/lib/zt_common.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/lib/zt_common.h b/include/lib/zt_common.h
index 858d19cd..6dcfe18f 100644
--- a/include/lib/zt_common.h
+++ b/include/lib/zt_common.h
@@ -32,6 +32,10 @@
 
 #ifndef __ASSEMBLER__
 
+#ifndef sizeof_field
+#define sizeof_field(type, field) (sizeof((type *)0)->field)
+#endif
+
 #ifdef UNUSED
 #elif defined(__GNUC__)
 # define UNUSED(x) UNUSED_ ## x __attribute__((unused))