From ce251e0e3c0597ea8cab5787df579bd1f9c1aca1 Mon Sep 17 00:00:00 2001
From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Tue, 16 Jul 2019 16:26:42 -0700
Subject: [PATCH] include/linux/kernel.h: add typeof_member() macro

Add typeof_member() macro so that types can be extracted without
introducing dummy variables.

Link: http://lkml.kernel.org/r/20190529190720.GA5703@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/kernel.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 0c9bc231107f..4fa360a13c1e 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -88,6 +88,8 @@
  */
 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 
+#define typeof_member(T, m)	typeof(((T*)0)->m)
+
 #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP
 
 #define DIV_ROUND_DOWN_ULL(ll, d) \
-- 
2.39.5