linux-kernel - Re: [PATCH 5/6] comedi: drivers: ni_mio_common: Move 'range_ni_E_ao

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Message-ID: <20210521143925.xjmwluaoyer322lg@pengutronix.de>
Date:   Fri, 21 May 2021 16:39:25 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Ian Abbott <abbotti@....co.uk>,
        linux-kernel@...r.kernel.org,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        "David A. Schleef" <ds@...leef.org>,
        Mori Hess <fmhess@...rs.sourceforge.net>,
        Truxton Fulton <trux@...ode1.truxton.com>,
        linux-staging@...ts.linux.dev, linux-pwm@...r.kernel.org
Subject: Re: [PATCH 5/6] comedi: drivers: ni_mio_common: Move
 'range_ni_E_ao_ext' to where it is used

On Fri, May 21, 2021 at 02:54:31PM +0300, Dan Carpenter wrote:
> 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@....co.uk>
> > > > Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
> > > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > > Cc: Thierry Reding <thierry.reding@...il.com>
> > > > Cc: "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de>
> > > > Cc: Lee Jones <lee.jones@...aro.org>
> > > > Cc: "David A. Schleef" <ds@...leef.org>
> > > > Cc: Mori Hess <fmhess@...rs.sourceforge.net>
> > > > Cc: Truxton Fulton <trux@...xton.com>
> > > > Cc: linux-staging@...ts.linux.dev
> > > > Cc: linux-pwm@...r.kernel.org
> > > > Signed-off-by: Lee Jones <lee.jones@...aro.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.

I just tried

diff --git a/drivers/comedi/drivers/ni_mio_common.c b/drivers/comedi/drivers/ni_mio_common.c
index 4f80a4991f95..3b37c8b00ecd 100644
--- a/drivers/comedi/drivers/ni_mio_common.c
+++ b/drivers/comedi/drivers/ni_mio_common.c
@@ -160,7 +160,7 @@ static const struct comedi_lrange range_ni_M_ai_628x = {
 	}
 };
 
-static const struct comedi_lrange range_ni_E_ao_ext = {
+const struct comedi_lrange range_ni_E_ao_ext = {
 	4, {
 		BIP_RANGE(10),
 		UNI_RANGE(10),
diff --git a/drivers/comedi/drivers/ni_stc.h b/drivers/comedi/drivers/ni_stc.h
index fbc0b753a0f5..026d215f2ef2 100644
--- a/drivers/comedi/drivers/ni_stc.h
+++ b/drivers/comedi/drivers/ni_stc.h
@@ -1137,6 +1137,6 @@ struct ni_private {
 	u8 rgout0_usage;
 };
 
-static const struct comedi_lrange range_ni_E_ao_ext;
+extern const struct comedi_lrange range_ni_E_ao_ext;
 
 #endif /* _COMEDI_NI_STC_H */

and it built for me.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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