Re: [PATCH 5/6] comedi: drivers: ni_mio_common: Move 'range_ni_E_ao_ext' to where it is used

Dan Carpenter
2021-05-21T11:54:55Z

On Fri, May 21, 2021 at 08:26:35AM +0100, Lee Jones wrote:
> On Thu, 20 May 2021, Ian Abbott wrote:
>
> > On 20/05/2021 13:25, Lee Jones wrote:
> > > ... and mark it as __maybe_unused since not all users of the
> > > header file reference it.
> > >
> > > Fixes the following W=1 kernel build warning(s):
> > >
> > > drivers/staging/comedi/drivers/ni_mio_common.c:163:35: warning: ‘range_ni_E_ao_ext’ defined but not used [-Wunused-const-variable=]
> > >
> > > Cc: Ian Abbott <abbotti@mev.co.uk>
> > > Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
> > > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > > Cc: Thierry Reding <thierry.reding@gmail.com>
> > > Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
> > > Cc: Lee Jones <lee.jones@linaro.org>
> > > Cc: "David A. Schleef" <ds@schleef.org>
> > > Cc: Mori Hess <fmhess@users.sourceforge.net>
> > > Cc: Truxton Fulton <trux@truxton.com>
> > > Cc: linux-staging@lists.linux.dev
> > > Cc: linux-pwm@vger.kernel.org
> > > Signed-off-by: Lee Jones <lee.jones@linaro.org>
> > > ---
> > > drivers/comedi/drivers/ni_mio_common.c | 9 ---------
> > > drivers/comedi/drivers/ni_stc.h | 9 ++++++++-
> > > 2 files changed, 8 insertions(+), 10 deletions(-)
> > >
> > > diff --git a/drivers/comedi/drivers/ni_mio_common.c b/drivers/comedi/drivers/ni_mio_common.c
> > > index 4f80a4991f953..37615b4e2c10d 100644
> > > --- a/drivers/comedi/drivers/ni_mio_common.c
> > > +++ b/drivers/comedi/drivers/ni_mio_common.c
> > > @@ -160,15 +160,6 @@ static const struct comedi_lrange range_ni_M_ai_628x = {
> > > }
> > > };
> > > -static const struct comedi_lrange range_ni_E_ao_ext = {
> > > - 4, {
> > > - BIP_RANGE(10),
> > > - UNI_RANGE(10),
> > > - RANGE_ext(-1, 1),
> > > - RANGE_ext(0, 1)
> > > - }
> > > -};
> > > -
> > > static const struct comedi_lrange *const ni_range_lkup[] = {
> > > [ai_gain_16] = &range_ni_E_ai,
> > > [ai_gain_8] = &range_ni_E_ai_limited,
> > > diff --git a/drivers/comedi/drivers/ni_stc.h b/drivers/comedi/drivers/ni_stc.h
> > > index fbc0b753a0f59..0822e65f709dd 100644
> > > --- a/drivers/comedi/drivers/ni_stc.h
> > > +++ b/drivers/comedi/drivers/ni_stc.h
> > > @@ -1137,6 +1137,13 @@ struct ni_private {
> > > u8 rgout0_usage;
> > > };
> > > -static const struct comedi_lrange range_ni_E_ao_ext;
> > > +static const struct comedi_lrange __maybe_unused range_ni_E_ao_ext = {
> > > + 4, {
> > > + BIP_RANGE(10),
> > > + UNI_RANGE(10),
> > > + RANGE_ext(-1, 1),
> > > + RANGE_ext(0, 1)
> > > + }
> > > +};
> > > #endif /* _COMEDI_NI_STC_H */
> > >
> >
> > The "ni_stc.h" header is also included by "ni_mio_cs.c" which doesn't need
> > `range_ni_E_ao_ext` (admittedly, it was already pulling in a "tentative"
> > definition of the variable).
> >
> > Thinking about it, I think it's probably better to move `range_ni_E_ao_ext`
> > from "ni_mio_common.c" into *both* "ni_atmio.c" and "ni_pcimio.c" (I think
> > we can live with the small amount of duplication), and to remove the
> > tentative definition from "ni_stc.h".
>
> Happy to rework.
>
> Am I taking this or Uwe's suggestion?

You should probably take Ian's suggestion because he is the maintainer
and I really doubt Uwe's will build. :P But Uwe is right that
including .c files is ugly.

regards,
dan carpenter