linux-kernel - Re: [PATCH] ALSA: echoaudio: simplify get_audio

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Date:   Sun, 08 Dec 2019 09:48:11 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Olof Johansson <olof@...om.net>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: echoaudio: simplify get_audio_levels

On Sat, 07 Dec 2019 23:49:53 +0100,
Olof Johansson wrote:
> 
> The loop optimizer seems to go astray here, and produces some warnings
> that don't seem valid.
> 
> Still, the code can be simplified -- just clear the whole array at the
> beginning, and fill in whatever values are valid on the platform.
> 
> Warnings before this change (GCC 8.2.0 ARM allmodconfig):
> 
> In file included from ../sound/pci/echoaudio/gina24.c:115:
> ../sound/pci/echoaudio/echoaudio.c: In function 'snd_echo_vumeters_get':
> ../sound/pci/echoaudio/echoaudio_dsp.c:647:9: warning: iteration 1073741824 invokes undefined behavior [-Waggressive-loop-optimizations]
> In file included from ../sound/pci/echoaudio/layla24.c:112:
> ../sound/pci/echoaudio/echoaudio.c: In function 'snd_echo_vumeters_get':
> ../sound/pci/echoaudio/echoaudio_dsp.c:658:9: warning: iteration 1073741824 invokes undefined behavior [-Waggressive-loop-optimizations]
> ../sound/pci/echoaudio/echoaudio_dsp.c:647:9: warning: iteration 1073741824 invokes undefined behavior [-Waggressive-loop-optimizations]
> 
> Signed-off-by: Olof Johansson <olof@...om.net>

Applied now, thanks.


Takashi