netdev - Re: [RFC PATCH 08/11] lib: other kernel glue layer code

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Date:	Tue, 31 Mar 2015 16:36:55 +0900
From:	Hajime Tazaki <tazaki@...e.ad.jp>
To:	richard@....at
Cc:	linux-arch@...r.kernel.org, arnd@...db.de, corbet@....net,
	cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
	iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	netdev@...r.kernel.org, linux-mm@...ck.org, jdike@...toit.com,
	rusty@...tcorp.com.au, mathieu.lacage@...il.com,
	christoph.paasch@...il.com
Subject: Re: [RFC PATCH 08/11] lib: other kernel glue layer code


Hi Richard,

thanks again.

At Sun, 29 Mar 2015 20:17:02 +0200,
Richard Weinberger wrote:
> 
> Am 24.03.2015 um 14:10 schrieb Hajime Tazaki:
> > These files are used to provide the same function calls so that other
> > network stack code keeps untouched.
> > 
> > Signed-off-by: Hajime Tazaki <tazaki@....wide.ad.jp>
> > Signed-off-by: Christoph Paasch <christoph.paasch@...il.com>
> > ---
> >  arch/lib/cred.c     |  16 +++
> >  arch/lib/dcache.c   |  93 +++++++++++++++
> >  arch/lib/filemap.c  |  27 +++++
> >  arch/lib/fs.c       | 287 ++++++++++++++++++++++++++++++++++++++++++++
> >  arch/lib/glue.c     | 336 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  arch/lib/inode.c    | 146 +++++++++++++++++++++++
> >  arch/lib/modules.c  |  36 ++++++
> >  arch/lib/pid.c      |  29 +++++
> >  arch/lib/print.c    |  56 +++++++++
> >  arch/lib/proc.c     | 164 +++++++++++++++++++++++++
> >  arch/lib/random.c   |  53 +++++++++
> >  arch/lib/security.c |  45 +++++++
> >  arch/lib/seq.c      | 122 +++++++++++++++++++
> >  arch/lib/splice.c   |  20 ++++
> >  arch/lib/super.c    | 210 ++++++++++++++++++++++++++++++++
> >  arch/lib/sysfs.c    |  83 +++++++++++++
> >  arch/lib/vmscan.c   |  26 ++++
> >  17 files changed, 1749 insertions(+)
> 
> BTW: Why do you need these stub implementations at all?
> If I read your code correctly it is because you're linking against the whole net/ directory.
> Let's take register_filesystem() again as example. net/socket.c references it in sock_init().
> Maybe it would make sense to split socket.c into two files, net/socket.c and net/sockfs.c.
> Such that you could link only net/socket.o.
> Of course you'd have to convince networking folks first. :D

this is something that we've been avoided: we weren't able
to estimate how much such splits will expand.

> By linking selectively objects files from net/ you could get rid of a lot unneeded stubs.

now I'm trying to minimize those stubs by reusing the original
codes (i.e., fs/filesystems.c for register_filesystem()). I
will let you know once I've done (maybe v2 RFC if you think
it's better ?)

-- Hajime
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