linux-kernel - Re: [PATCH] ALSA: usb-audio: make array static const, makes object smaller

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Date:   Sun, 01 Aug 2021 10:05:49 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Colin King <colin.king@...onical.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: make array static const, makes object smaller

On Sun, 01 Aug 2021 08:25:48 +0200,
Colin King wrote:
> 
> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate array names_to_check on the stack but instead it
> static.  Makes the object code smaller by 56 bytes.
> 
> Before:
>    text    data     bss     dec     hex filename
>  103512   34380       0  137892   21aa4 ./sound/usb/mixer.o
> 
> After:
>    text    data     bss     dec     hex filename
>  103264   34572       0  137836   21a6c ./sound/usb/mixer.o
> 
> gcc version 10.2.0)
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  sound/usb/mixer.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
> index f4cdaf1ba44a..aec2499284a5 100644
> --- a/sound/usb/mixer.c
> +++ b/sound/usb/mixer.c
> @@ -1572,8 +1572,9 @@ static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
>  static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
>  					struct snd_card *card)
>  {
> -	const char *names_to_check[] = {
> -		"Headset", "headset", "Headphone", "headphone", NULL};
> +	static const char *names_to_check[] = {
> +		"Headset", "headset", "Headphone", "headphone", NULL
> +	};

checkpatch complains like:
  WARNING: static const char * array should probably be static const
  char * const

Could you check and resubmit if it's right?


thanks,

Takashi