linux-kernel - Re: [RFC PATCH v2] lib: scatterlist: add sg splitting function

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Date:	Tue, 4 Aug 2015 14:24:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [RFC PATCH v2] lib: scatterlist: add sg splitting function

On Tue, 04 Aug 2015 19:04:36 +0200 Robert Jarzmik <robert.jarzmik@...e.fr> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> >>  include/linux/scatterlist.h |   5 ++
> >>  lib/scatterlist.c           | 189 ++++++++++++++++++++++++++++++++++++++++++++
> >>  2 files changed, 194 insertions(+)
> >
> > It's quite a bit of code for a fairly specialised thing.  How ugly
> > would it be to put this in a new .c file and have subsystems select it
> > in Kconfig?
> I have no idea about the "ugliness", but why not ...
> 
> If nobody objects, and in order to submit a proper patch, there are decisions to
> make :
>  - what will be the scope of this new .c file ?
>    - only sg_plit() ?
>    - all sg specialized functions, ie. sg_lib.c ?

Just sg_split I'd say.  It's a logical unit.  Other things can be moved
elsewhere later as cleanups/optimisations, but that's all off-topic.

>  - will include/linux/scatterlist.h have an "ifdefed" portion for what X.c
>    offers ?

I prefer to avoid the ifdefs.  This means that the error is reported at
link-time rather than compile-time but that's a pretty small cost and
it's a once-off inconvenience, whereas messy/complex header files are
permanent.

>  - what naming for X.c and the config entry ?

um, CONFIG_SG_SPLIT and sg_split.c?

> What about adding this to lib/Makefile, and one ifdef to scatterlist.h ? :
>      obj-$(CONFIG_SG_LIB) += sg_lib.o

It would be obj-$(CONFIG_SG_SPLIT) += sg_split.o
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