Hi Christoph,

On Fri, 24 Apr 2020 08:43:36 +0200 Christoph Hellwig <hch@lst.de> wrote:
>
> 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@lst.de>
> ---
>  include/linux/coredump.h |  4 ++++
>  include/linux/file.h     |  2 ++
>  include/linux/mm.h       |  2 ++
>  include/linux/mmzone.h   |  2 ++
>  include/linux/pid.h      |  3 +++
>  include/linux/sysctl.h   |  8 +++++++
>  kernel/sysctl.c          | 45 +++-------------------------------------
>  7 files changed, 24 insertions(+), 42 deletions(-)

A couple of suggestions for another patch (since this one is in a
shared branch in Al's tree now):

There is an "extern struct ctl_table random_table[];" in
drivers/char/random.c which is redundant now (in fact always was).

There is already an "extern struct ctl_table epoll_table[];" in
include/linux/poll.h, so could have included that in kernel/sysctl.c
instead of adding the new one in include/linux/sysctl.h

-- 
Cheers,
Stephen Rothwell