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From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Lee Jones <lee.jones@linaro.org>
Cc: linux-kernel@vger.kernel.org, Ian Abbott <abbotti@mev.co.uk>,
	H Hartley Sweeten <hsweeten@visionengravers.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	"David A. Schleef" <ds@schleef.org>,
	Mori Hess <fmhess@users.sourceforge.net>,
	Truxton Fulton <trux@truxton.com>,
	linux-staging@lists.linux.dev, linux-pwm@vger.kernel.org
Subject: Re: [PATCH 55/57] staging: comedi: drivers: ni_mio_common: Move 'range_ni_E_ao_ext' to where it is used
Date: Thu, 15 Apr 2021 08:55:35 +0200	[thread overview]
Message-ID: <20210415065535.eff56u7nhfhrcnl3@pengutronix.de> (raw)
In-Reply-To: <20210414181129.1628598-56-lee.jones@linaro.org>

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Hello Lee,

nitpick: You move range_ni_E_ao_ext to the header. However that header
doesn't use range_ni_E_ao_ext, so the subject is technically wrong.

On Wed, Apr 14, 2021 at 07:11:27PM +0100, 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/staging/comedi/drivers/ni_mio_common.c | 9 ---------
>  drivers/staging/comedi/drivers/ni_stc.h        | 9 ++++++++-
>  2 files changed, 8 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
> index 4f80a4991f953..37615b4e2c10d 100644
> --- a/drivers/staging/comedi/drivers/ni_mio_common.c
> +++ b/drivers/staging/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/staging/comedi/drivers/ni_stc.h b/drivers/staging/comedi/drivers/ni_stc.h
> index fbc0b753a0f59..0822e65f709dd 100644
> --- a/drivers/staging/comedi/drivers/ni_stc.h
> +++ b/drivers/staging/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)
> +	}
> +};

I think a downside of this solution is that range_ni_E_ao_ext might be
duplicated in the object files. (Ditto for the status quo BTW.)

I think the right approach to fix the compiler warning and the
duplication is to declare range_ni_E_ao_ext external in the header and
keep the definition in ni_mio_common.c.

Best regards
Uwe

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

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  reply	other threads:[~2021-04-15  6:55 UTC|newest]

Thread overview: 79+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-14 18:10 [PATCH 00/57] Rid W=1 warnings from Staging Lee Jones
2021-04-14 18:10 ` [PATCH 01/57] staging: r8192U_core: Remove unused variable 'ret' and demote kernel-doc abuse Lee Jones
2021-04-14 18:10 ` [PATCH 02/57] staging: android: ashmem: Supply description for 'new_range' Lee Jones
2021-04-15 16:30   ` Todd Kjos
2021-04-14 18:10 ` [PATCH 03/57] staging: comedi_8254: Fix descriptions for 'i8254' and 'iobase' Lee Jones
2021-04-14 18:10 ` [PATCH 04/57] staging: r8192U_core: Do not use kernel-doc formatting for !kernel-doc headers Lee Jones
2021-04-14 18:10 ` [PATCH 05/57] staging: r819xU_phy: Remove some local variables from the stack Lee Jones
2021-04-14 18:10 ` [PATCH 06/57] staging: r819xU_cmdpkt: Remove functionless method 'cmpk_handle_query_config_rx' Lee Jones
2021-04-14 18:10 ` [PATCH 07/57] staging: wlan-ng: cfg80211: Move large struct onto the heap Lee Jones
2021-04-14 18:10 ` [PATCH 08/57] staging: rtw_ioctl_set: Move 'channel_table' to the only place it's used Lee Jones
2021-04-14 18:10 ` [PATCH 09/57] staging: rtl8188eu: core: rtw_ieee80211: Fix incorrectly documented function Lee Jones
2021-04-14 18:10 ` [PATCH 10/57] staging: rtl8723bs: core: rtw_mlme: Remove a bunch of unused variables Lee Jones
2021-04-14 18:10 ` [PATCH 11/57] staging: rtl8723bs: core: rtw_mlme_ext: Deal with " Lee Jones
2021-04-14 18:10 ` [PATCH 12/57] staging: rtl8712: rtl871x_mp_ioctl: Remove a bunch of unused tables Lee Jones
2021-04-14 18:10 ` [PATCH 13/57] staging: rtl8723bs: core: rtw_recv: Mark debug variable as __maybe_unused Lee Jones
2021-04-14 18:10 ` [PATCH 14/57] staging: rtl8188eu: core: rtw_security: Fix some formatting and misdocumentation Lee Jones
2021-04-14 18:10 ` [PATCH 15/57] staging: rtl8723bs: core: rtw_security: Demote non-conformant kernel-doc header Lee Jones
2021-04-15  8:09   ` Fabio Aiuto
2021-04-15  8:31     ` Lee Jones
2021-04-15  8:38       ` Fabio Aiuto
2021-04-14 18:10 ` [PATCH 16/57] staging: rtl8723bs: core: rtw_sta_mgt: Remove unused variable 'psta' Lee Jones
2021-04-14 18:10 ` [PATCH 17/57] staging: rtl8723bs: core: rtw_sta_mgt: Return error value directly Lee Jones
2021-04-14 18:10 ` [PATCH 18/57] staging: octeon: ethernet-tx: Fix formatting issue in function header Lee Jones
2021-04-14 18:10 ` [PATCH 19/57] staging: rtl8723bs: core: rtw_wlan_util: Remove unused variable 'start_seq' Lee Jones
2021-04-14 18:10 ` [PATCH 20/57] staging: rtl8712: rtl871x_mp_ioctl: Move a large data struct onto the heap Lee Jones
2021-04-14 18:10 ` [PATCH 21/57] staging: iio: frequency: ad9834: Provide missing description for 'devid' Lee Jones
2021-04-16 17:29   ` Jonathan Cameron
2021-04-14 18:10 ` [PATCH 22/57] staging: nvec: Fix a bunch of kernel-doc issues Lee Jones
2021-04-14 18:10 ` [PATCH 23/57] staging: ks7010: ks_hostif: Remove a bunch of unused variables Lee Jones
2021-04-14 18:10 ` [PATCH 24/57] staging: fwserial: Demote a whole host of kernel-doc abuses Lee Jones
2021-04-14 18:10 ` [PATCH 25/57] staging: sm750fb: sm750_accel: Provide description for 'accel' and fix function naming Lee Jones
2021-04-14 18:10 ` [PATCH 26/57] staging: most: net: Fix some kernel-doc formatting issues Lee Jones
2021-04-14 18:10 ` [PATCH 27/57] staging: vt6655: upc: Suppress set but not used warning in macro Lee Jones
2021-04-14 18:11 ` [PATCH 28/57] staging: rtl8192u: ieee80211_softmac: Move a large data struct onto the heap Lee Jones
2021-04-14 18:11 ` [PATCH 29/57] staging: most: dim2: Provide missing descriptions and fix doc-rot Lee Jones
2021-04-14 18:11 ` [PATCH 30/57] staging: rtl8723bs: core: rtw_ieee80211: Remove seemingly pointless copy Lee Jones
2021-04-14 18:11 ` [PATCH 31/57] staging: rtl8723bs: core: rtw_mlme: 'retry' is only used if REJOIN is set Lee Jones
2021-04-14 18:11 ` [PATCH 32/57] staging: rtl8723bs: core: rtw_mlme_ext: 'evt_seq' is only used if CHECK_EVENT_SEQ " Lee Jones
2021-04-14 18:11 ` [PATCH 33/57] staging: most: i2c: Fix a little doc-rot Lee Jones
2021-04-14 18:11 ` [PATCH 34/57] staging: most: dim2: hal: Fix one kernel-doc header and demote two non-conforming ones Lee Jones
2021-04-14 18:11 ` [PATCH 35/57] staging: most: dim2: hal: Demote non-conformant kernel-doc headers Lee Jones
2021-04-14 18:11 ` [PATCH 36/57] staging: axis-fifo: axis-fifo: Fix some formatting issues Lee Jones
2021-04-14 18:11 ` [PATCH 37/57] staging: rtl8188eu: os_dep: ioctl_linux: Move 2 large data buffers into the heap Lee Jones
2021-04-15  5:20   ` Dan Carpenter
2021-04-15  5:25     ` Dan Carpenter
2021-04-19 14:05       ` Arnd Bergmann
2021-04-15  5:53     ` Dan Carpenter
2021-04-15  8:32       ` Lee Jones
2021-04-14 18:11 ` [PATCH 38/57] staging: fbtft: fb_ili9320: Remove unused variable 'ret' Lee Jones
2021-04-14 18:11 ` [PATCH 39/57] staging: rtl8723bs: core: rtw_ieee80211: Fix incorrectly named function Lee Jones
2021-04-14 18:11 ` [PATCH 40/57] staging: rtl8723bs: hal: odm_NoiseMonitor: Remove unused variable and dead code Lee Jones
2021-04-14 18:11 ` [PATCH 41/57] staging: rtl8188eu: os_dep: mon: Demote non-conforming kernel-doc headers Lee Jones
2021-04-14 18:11 ` [PATCH 42/57] staging: rtl8188eu: os_dep: rtw_android: Demote kernel-doc abuse Lee Jones
2021-04-14 18:11 ` [PATCH 43/57] staging: rtl8723bs: hal: rtl8723b_hal_init: Remove unused variable and dead code Lee Jones
2021-04-14 18:11 ` [PATCH 44/57] staging: rtl8723bs: hal: rtl8723b_phycfg: Fix a bunch of misnamed functions Lee Jones
2021-04-14 18:11 ` [PATCH 45/57] staging: rtl8723bs: hal: sdio_halinit: 'start' is only used if debug is enabled Lee Jones
2021-04-14 18:11 ` [PATCH 46/57] staging: rtl8723bs: hal: sdio_ops: Mark used 'err' as __maybe_unused and remove another Lee Jones
2021-04-14 18:11 ` [PATCH 47/57] staging: rtl8723bs: os_dep: ioctl_cfg80211: 'ack' is used when debug is enabled Lee Jones
2021-04-14 18:11 ` [PATCH 48/57] staging: comedi: drivers: jr3_pci: Remove set but unused variable 'min_full_scale' Lee Jones
2021-04-15  9:33   ` Ian Abbott
2021-04-15  9:52     ` Lee Jones
2021-04-14 18:11 ` [PATCH 49/57] staging: comedi: drivers: ni_tio: Fix slightly broken kernel-doc and demote others Lee Jones
2021-04-14 18:11 ` [PATCH 50/57] staging: comedi: drivers: ni_routes: Demote non-conforming kernel-doc headers Lee Jones
2021-04-14 18:11 ` [PATCH 51/57] staging: axis-fifo: axis-fifo: Fix function naming in the documentation Lee Jones
2021-04-14 18:11 ` [PATCH 52/57] staging: rtl8723bs: hal: odm_NoiseMonitor: Remove unused variable 'func_start' Lee Jones
2021-04-14 18:11 ` [PATCH 53/57] staging: rtl8723bs: core: rtw_mlme_ext: Move very large data buffer onto the heap Lee Jones
2021-04-14 18:11 ` [PATCH 54/57] staging: rtl8723bs: hal: rtl8723b_hal_init: Mark a bunch of debug variables as __maybe_unused Lee Jones
2021-04-14 18:11 ` [PATCH 55/57] staging: comedi: drivers: ni_mio_common: Move 'range_ni_E_ao_ext' to where it is used Lee Jones
2021-04-15  6:55   ` Uwe Kleine-König [this message]
2021-04-15  8:34     ` Lee Jones
2021-04-15  9:39   ` Ian Abbott
2021-04-15  9:54     ` Lee Jones
2021-04-14 18:11 ` [PATCH 56/57] staging: comedi: drivers: comedi_isadma: Fix misspelling of 'dma_chan1' Lee Jones
2021-04-14 18:11 ` [PATCH 57/57] staging: rtl8723bs: hal: sdio_halinit: Remove unused variable 'ret' Lee Jones
2021-04-15  9:16   ` Fabio Aiuto
2021-04-15  9:53     ` Lee Jones
2021-04-16  7:27 ` [PATCH 00/57] Rid W=1 warnings from Staging Fabio Aiuto
2021-04-16  7:31   ` Greg Kroah-Hartman
2021-04-27  9:31 ` Greg Kroah-Hartman

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