linux-kernel - Re: [PATCH v4 12/32] sound: usb: Export USB SND APIs for modules

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Date:   Tue, 25 Jul 2023 07:33:57 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wesley Cheng <quic_wcheng@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        catalin.marinas@....com, will@...nel.org, mathias.nyman@...el.com,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, srinivas.kandagatla@...aro.org,
        bgoswami@...cinc.com, Thinh.Nguyen@...opsys.com,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-usb@...r.kernel.org, alsa-devel@...a-project.org,
        quic_jackp@...cinc.com, pierre-louis.bossart@...ux.intel.com,
        oneukum@...e.com, albertccwang@...gle.com, o-takashi@...amocchi.jp
Subject: Re: [PATCH v4 12/32] sound: usb: Export USB SND APIs for modules

On Mon, Jul 24, 2023 at 07:33:56PM -0700, Wesley Cheng wrote:
> --- a/sound/usb/pcm.c
> +++ b/sound/usb/pcm.c
> @@ -87,7 +87,7 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream
>  /*
>   * find a matching audio format
>   */
> -static const struct audioformat *
> +const struct audioformat *
>  find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
>  	    unsigned int rate, unsigned int channels, bool strict_match,
>  	    struct snd_usb_substream *subs)
> @@ -147,8 +147,9 @@ find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
>  	}
>  	return found;
>  }
> +EXPORT_SYMBOL_GPL(find_format);

This is a horrible symbol name for a global function, same for the other
ones in this file.  If you really want to export them, please put them
in the proper "snd_" prefix namespace, or better yet, use a module
namespace as well to ensure that we know who is using them.

thanks,

greg k-h