netdev - Re: [PATCH 4/6] sysctl: remove all extern declaration from sysctl.c

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Date:   Wed, 22 Apr 2020 07:33:11 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Christoph Hellwig <hch@....de>
Cc:     Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH 4/6] sysctl: remove all extern declaration from sysctl.c

Christoph Hellwig <hch@....de> writes:

> Extern declarations in .c files are a bad style and can lead to
> mismatches.  Use existing definitions in headers where they exist,
> and otherwise move the external declarations to suitable header
> files.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  include/linux/coredump.h |  6 ++++++
>  include/linux/file.h     |  2 ++
>  include/linux/mm.h       |  2 ++
>  include/linux/mmzone.h   |  2 ++
>  include/linux/sysctl.h   |  8 +++++++
>  kernel/sysctl.c          | 45 +++-------------------------------------
>  6 files changed, 23 insertions(+), 42 deletions(-)
>
> diff --git a/include/linux/coredump.h b/include/linux/coredump.h
> index abf4b4e65dbb..0fe8f3131e97 100644
> --- a/include/linux/coredump.h
> +++ b/include/linux/coredump.h
> @@ -22,4 +22,10 @@ extern void do_coredump(const kernel_siginfo_t *siginfo);
>  static inline void do_coredump(const kernel_siginfo_t *siginfo) {}
>  #endif
>  
> +extern int core_uses_pid;
> +extern char core_pattern[];
> +extern unsigned int core_pipe_limit;
> +extern int pid_max;
> +extern int pid_max_min, pid_max_max;

These last two pid_max, pid_max_mind and pid_max_max would make more
sense in pid.h as they have nothing to do with coredumps.

> +
>  #endif /* _LINUX_COREDUMP_H */