linux-kernel - Re: [PATCH] uapi: fix linux/sysctl.h userspace compilation errors

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Date:   Thu, 23 Feb 2017 14:34:58 +1300
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uapi: fix linux/sysctl.h userspace compilation errors

"Dmitry V. Levin" <ldv@...linux.org> writes:

> Include <stddef.h> (guarded by #ifndef __KERNEL__) to fix the following
> linux/sysctl.h userspace compilation errors:
>
> /usr/include/linux/sysctl.h:38:2: error: unknown type name 'size_t'
>   size_t *oldlenp;
> /usr/include/linux/sysctl.h:40:2: error: unknown type name 'size_t'
>   size_t newlen;
>
> This also fixes userspace compilation of uapi headers that include
> linux/sysctl.h, e.g. linux/netfilter.h.

Are these compilation errors new?

Perhaps we should just refactor linux/netfilter.h not to depend on
linux/sysctl.h.  The definitions in linux/sysctl.h are essentially dead
at this point and I would not expect any new, are really not any old
programs to depend on linux/sysctl.h.  As I don't expect new users of
linux/sysctl.h I don't see how changing anything in the header is
meaningful.

Either the old users work or the old users are broken.

Eric


> Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> ---
>  include/uapi/linux/sysctl.h | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
> index d2b1215..c6d18aa 100644
> --- a/include/uapi/linux/sysctl.h
> +++ b/include/uapi/linux/sysctl.h
> @@ -26,6 +26,10 @@
>  #include <linux/types.h>
>  #include <linux/compiler.h>
>  
> +#ifndef __KERNEL__
> +#include <stddef.h>		/* For size_t. */
> +#endif
> +
>  #define CTL_MAXNAME 10		/* how many path components do we allow in a
>  				   call to sysctl?   In other words, what is
>  				   the largest acceptable value for the nlen