linux-kernel - Re: [PATCH] Fix logical-not-parentheses warning

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Date:	Sun, 02 Aug 2015 07:16:25 -0700
From:	Joe Perches <joe@...ches.com>
To:	Tomer Barletz <barletz@...il.com>
Cc:	clemens@...isch.de, perex@...ex.cz, tiwai@...e.com,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix logical-not-parentheses warning

On Sun, 2015-08-02 at 02:08 -0700, Tomer Barletz wrote:
> This fixes the following warning, that is seen with gcc 5.1:
> warning: logical not is only applied to the left hand side of 
> comparison [-Wlogical-not-parentheses].
[]
> diff --git a/sound/pci/oxygen/oxygen_mixer.c 
[]
> 
@@ -88,7 +88,7 @@ static int dac_mute_put(struct snd_kcontrol *ctl,
>       int changed;
>  
>       mutex_lock(&chip->mutex);
> -     changed = !value->value.integer.value[0] != chip->dac_mute;
> +     changed = (!value->value.integer.value[0]) != chip->dac_mute;

It seems this is because dac_mute's value is inverted
0 means true, 1 is false.

I think it'd be simpler if dac_mute was converted to a
standard bool (or perhaps renamed to not_muted) and
this test was rewritten.

Using !!value->value.integer.value[0] would also be
more readable and intelligible.

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