Hi Takashi, This patch seems legitimate to me (although I would adjust whitespace so the second line doesn't go over 80 chars). Do you want to just apply it as-is, or do you want me to send a second version of my patch without this problem or send a new patch similar to this one? Also sorry I don't know what the etiquette is in cc's for this message :(. The message from kernel test robot was sent to a lot of people who I don't think would be interested in this, so I trimmed the cc list down. Thanks, Geoffrey. On Sun, May 23, 2021 at 02:09:00AM +0800, kernel test robot wrote: > sound/usb/mixer_scarlett_gen2.c:2000:5: warning: symbol 'snd_scarlett_gen2_controls_create' was not declared. Should it be static? > > Fixes: 265d1a90e4fb ("ALSA: usb-audio: scarlett2: Improve driver startup messages") > Reported-by: kernel test robot <lkp@xxxxxxxxx> > Signed-off-by: kernel test robot <lkp@xxxxxxxxx> > --- > mixer_scarlett_gen2.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c > index 3ad8f61a2095f..4caf379d5b991 100644 > --- a/sound/usb/mixer_scarlett_gen2.c > +++ b/sound/usb/mixer_scarlett_gen2.c > @@ -1997,8 +1997,8 @@ static int scarlett2_mixer_status_create(struct usb_mixer_interface *mixer) > return usb_submit_urb(mixer->urb, GFP_KERNEL); > } > > -int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer, > - const struct scarlett2_device_info *info) > +static int snd_scarlett_gen2_controls_create(struct usb_mixer_interface *mixer, > + const struct scarlett2_device_info *info) > { > int err; >