Message-ID: <55510DE0.3080909@redhat.com>
Date: Mon, 11 May 2015 22:15:28 +0200
From: Denys Vlasenko <dvlasenk@redhat.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
MIME-Version: 1.0
To: Giuliano Pochini <pochini@shiny.it>, Takashi Iwai <tiwai@suse.de>,
        Jaroslav Kysela <perex@suse.cz>, LKML <linux-kernel@vger.kernel.org>
Subject: Object code duplication in sound/pci/echoaudio/
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1355
Lines: 42

There are fourteen files in sound/pci/echoaudio/, namely:

darla20.c darla24.c echo3g.c gina20.c gina24.c indigo.c
indigodj.c indigodjx.c indigoio.c indigoiox.c layla20.c
layla24.c mia.c mona.c

Which use the following method of "code reuse":

#include "echoaudio_dsp.c"
#include "echoaudio_gml.c"
#include "echoaudio.c"

echoaudio.c is not a header file, it contains a bunch of
static functions, some of a considerable size.
This makes those functions to be duplicated many times over.

For instance, there are fourteen instances of init_engine(),
each 1117 bytes long. Fourteen instances of pcm_open(), each 556 bytes
long.

11 get_firmware
10 free_firmware
13 audiopipe_free
14 init_hw
14 hw_rule_capture_format_by_channels
14 hw_rule_capture_channels_by_format
14 hw_rule_playback_format_by_channels
14 hw_rule_playback_channels_by_format

and so on.

In my humble opinion, this is not a good coding practice.
You should not duplicate functions like this.
Where possible, you need to reuse a single instance of a function.

According to git, author of these drivers is Giuliano Pochini
<pochini@shiny.it>.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/