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

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Date:	Tue, 04 Aug 2015 19:04:36 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>
Cc:	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

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 ?
 - will include/linux/scatterlist.h have an "ifdefed" portion for what X.c
   offers ?
 - what naming for X.c and the config entry ?

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

Cheers.

-- 
Robert
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