linux-kernel - Re: [PATCH] uapi/linux/stddef.h: add include guards

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Date:   Wed, 30 Mar 2022 14:49:46 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Tadeusz Struk <tadeusz.struk@...aro.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Gustavo Silva <gustavoars@...nel.org>,
        Keith Packard <keithp@...thp.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uapi/linux/stddef.h: add include guards

On Tue, Mar 29, 2022 at 10:12:52AM -0700, Tadeusz Struk wrote:
> Add iclude guarde to uapi/linux/stddef.h to prevent
> redefining macros.
> 
> Signed-off-by: Tadeusz Struk <tadeusz.struk@...aro.org>

Hi!

What was tripping over this? This isn't a new file, so has something
changed with how it has been included?

-Kees

> ---
>  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
> -- 
> 2.35.1
> 

-- 
Kees Cook