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

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Date:   Thu, 20 May 2021 14:45:03 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        "David A. Schleef" <ds@...leef.org>,
        Mori Hess <fmhess@...rs.sourceforge.net>,
        Truxton Fulton <trux@...xton.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 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".

-- 
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