linux-kernel - [PATCH 1/2] add typeof

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Message-ID: <20190529190720.GA5703@avx2>
Date:   Wed, 29 May 2019 22:07:20 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] add typeof_member() macro

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

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 include/linux/kernel.h |    2 ++
 1 file changed, 2 insertions(+)

--- 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) \