linux-kernel - [PATCH 5.17 012/219] uapi/linux/stddef.h: Add include guards

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Date:   Mon, 18 Apr 2022 14:09:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tadeusz Struk <tadeusz.struk@...aro.org>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH 5.17 012/219] uapi/linux/stddef.h: Add include guards

From: Tadeusz Struk <tadeusz.struk@...aro.org>

commit 55037ed7bdc62151a726f5685f88afa6a82959b1 upstream.

Add include guard wrapper define to uapi/linux/stddef.h to prevent macro
redefinition errors when stddef.h is included more than once. This was not
needed before since the only contents already used a redefinition test.

Signed-off-by: Tadeusz Struk <tadeusz.struk@...aro.org>
Link: https://lore.kernel.org/r/20220329171252.57279-1-tadeusz.struk@linaro.org
Fixes: 50d7bd38c3aa ("stddef: Introduce struct_group() helper macro")
Cc: stable@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/uapi/linux/stddef.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h
index 3021ea25a284..7837ba4fe728 100644
--- a/include/uapi/linux/stddef.h
+++ b/include/uapi/linux/stddef.h
@@ -1,4 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_STDDEF_H
+#define _UAPI_LINUX_STDDEF_H
+
 #include <linux/compiler_types.h>
 
 #ifndef __always_inline
@@ -41,3 +44,4 @@
 		struct { } __empty_ ## NAME; \
 		TYPE NAME[]; \
 	}
+#endif
-- 
2.35.2