linux-kernel - Re: [PATCH] comedi: Make ni_mio

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Date:   Fri, 21 May 2021 20:14:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Uwe Kleine-König <uwe@...ine-koenig.org>
Cc:     Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] comedi: Make ni_mio_common a standalone module

On Fri, May 21, 2021 at 07:27:50PM +0200, Uwe Kleine-König wrote:
> This allows to get rid of the ugly
> 
> 	#include "ni_mio_common.c"
> 
> in three modules.
> 
> For an amd64 allmodconfig this changed the size for the following object
> files:
>                                        |  before |  after
> drivers/comedi/drivers/ni_atmio.o      |  323944 |  20752
> drivers/comedi/drivers/ni_mio_cs.o     |  318376 |  14920
> drivers/comedi/drivers/ni_mio_common.o |       - | 324872
> drivers/comedi/drivers/ni_pcimio.o     |  389344 |  48168
> ---------------------------------------+---------+-------
>  sum                                   | 1031664 | 408712
> 
> So this results in a considerable decrease in binary size of more than
> 600 KiB.

Very nice!

One tiny nit that I can see that might matter later on (not now):

> @@ -168,6 +173,7 @@ static const struct comedi_lrange range_ni_E_ao_ext = {
>  		RANGE_ext(0, 1)
>  	}
>  };
> +EXPORT_SYMBOL_GPL(range_ni_E_ao_ext);

not the nicest global symbol, ideally these would all start with:
	comedi_ni_...

Oh wait, use the module namespace here!  Make a namespace for the NI
comedi drivers to use and then we don't care so much about the names
(within reason, 'allyesconfig' builds still will care).

But that's an add-on patch, not needed here.

thanks,

greg k-h