linux-kernel - Re: [PATCH 2/7] ASoC: atmel_wm8904: constify snd_soc

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Message-ID: <87b8b035-ddf2-dfe4-faf4-45d7ba0199bf@atmel.com>
Date:   Tue, 18 Oct 2016 10:13:25 +0200
From:   Nicolas Ferre <nicolas.ferre@...el.com>
To:     Julia Lawall <Julia.Lawall@...6.fr>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.com>
CC:     <kernel-janitors@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] ASoC: atmel_wm8904: constify snd_soc_ops structures

Le 15/10/2016 à 16:55, Julia Lawall a écrit :
> Check for snd_soc_ops structures that are only stored in the ops field of a
> snd_soc_dai_link structure.  This field is declared const, so snd_soc_ops
> structures that have this property can be declared as const also.
> 
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct snd_soc_ops i@p = { ... };
> 
> @ok1@
> identifier r.i;
> struct snd_soc_dai_link e;
> position p;
> @@
> e.ops = &i@p;
> 
> @ok2@
> identifier r.i, e;
> position p;
> @@
> struct snd_soc_dai_link e[] = { ..., { .ops = &i@p, }, ..., };
> 
> @bad@
> position p != {r.p,ok1.p,ok2.p};
> identifier r.i;
> struct snd_soc_ops e;
> @@
> e@i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r.i;
> @@
> static
> +const
>  struct snd_soc_ops i = { ... };
> // </smpl>
> 
> The effect on the layout of the .o file is shown by the following output of
> the size command, first before then after the transformation:
> 
>    text    data     bss     dec     hex filename
>    2611    1536       0    4147    1033 sound/soc/atmel/atmel_wm8904.o
>    2675    1480       0    4155    103b sound/soc/atmel/atmel_wm8904.o
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>

Thanks,

> 
> ---
>  sound/soc/atmel/atmel_wm8904.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff -u -p a/sound/soc/atmel/atmel_wm8904.c b/sound/soc/atmel/atmel_wm8904.c
> --- a/sound/soc/atmel/atmel_wm8904.c
> +++ b/sound/soc/atmel/atmel_wm8904.c
> @@ -53,7 +53,7 @@ static int atmel_asoc_wm8904_hw_params(s
>  	return 0;
>  }
>  
> -static struct snd_soc_ops atmel_asoc_wm8904_ops = {
> +static const struct snd_soc_ops atmel_asoc_wm8904_ops = {
>  	.hw_params = atmel_asoc_wm8904_hw_params,
>  };
>  
> 
> 


-- 
Nicolas Ferre