[PATCH 0/6] Rid W=1 warnings from Comedi

[PATCH 0/6] Rid W=1 warnings from Comedi

[Lee Jones]

This set is part of a larger effort attempting to clean-up W=1
kernel builds, which are currently overwhelmingly riddled with
niggly little warnings.

Lee Jones (6):
  comedi: comedi_8254: Fix descriptions for 'i8254' and 'iobase'
  comedi: drivers: jr3_pci: Remove set but unused variable
    'min_full_scale'
  comedi: drivers: ni_tio: Fix slightly broken kernel-doc and demote
    others
  comedi: drivers: ni_routes: Demote non-conforming kernel-doc headers
  comedi: drivers: ni_mio_common: Move 'range_ni_E_ao_ext' to where it
    is used
  comedi: drivers: comedi_isadma: Fix misspelling of 'dma_chan1'

 drivers/comedi/drivers/comedi_8254.c   |  3 ++-
 drivers/comedi/drivers/comedi_isadma.c |  2 +-
 drivers/comedi/drivers/jr3_pci.c       |  3 +--
 drivers/comedi/drivers/ni_mio_common.c |  9 ---------
 drivers/comedi/drivers/ni_routes.c     |  6 +++---
 drivers/comedi/drivers/ni_stc.h        |  9 ++++++++-
 drivers/comedi/drivers/ni_tio.c        | 12 ++++++------
 7 files changed, 21 insertions(+), 23 deletions(-)

Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
Cc: Anders Blomdell <anders.blomdell@control.lth.se>
Cc: Comedi <comedi@comedi.org>
Cc: "David A. Schleef" <ds@schleef.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herman.Bruyninckx@mech.kuleuven.ac.be
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: "J.P. Mellor" <jpmellor@rose-hulman.edu>
Cc: Klaas.Gadeyne@mech.kuleuven.ac.be
Cc: Lee Jones <lee.jones@linaro.org>
Cc: linux-pwm@vger.kernel.org
Cc: linux-staging@lists.linux.dev
Cc: Mori Hess <fmhess@users.sourceforge.net>
Cc: "Spencer E. Olson" <olsonse@umich.edu>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Truxton Fulton <trux@truxton.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Wim.Meeussen@mech.kuleuven.ac.be
-- 
2.31.1

[PATCH 1/6] comedi: comedi_8254: Fix descriptions for 'i8254' and 'iobase'

[Lee Jones]

Fixes the following W=1 kernel build warning(s):

 drivers/staging/comedi/drivers/comedi_8254.c:561: warning: Function parameter or member 'i8254' not described in 'comedi_8254_subdevice_init'
 drivers/staging/comedi/drivers/comedi_8254.c:620: warning: Function parameter or member 'iobase' not described in 'comedi_8254_init'
 drivers/staging/comedi/drivers/comedi_8254.c:620: warning: Excess function parameter 'mmio' description in 'comedi_8254_init'

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "David A. Schleef" <ds@schleef.org>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/comedi/drivers/comedi_8254.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/comedi_8254.c b/drivers/comedi/drivers/comedi_8254.c
index d1d509e9add94..4bf5daa9e8855 100644
--- a/drivers/comedi/drivers/comedi_8254.c
+++ b/drivers/comedi/drivers/comedi_8254.c
@@ -555,6 +555,7 @@ static int comedi_8254_insn_config(struct comedi_device *dev,
 /**
  * comedi_8254_subdevice_init - initialize a comedi_subdevice for the 8254 timer
  * @s:		comedi_subdevice struct
+ * @i8254:	comedi_8254 struct
  */
 void comedi_8254_subdevice_init(struct comedi_subdevice *s,
 				struct comedi_8254 *i8254)
@@ -607,7 +608,7 @@ static struct comedi_8254 *__i8254_init(unsigned long iobase,
 
 /**
  * comedi_8254_init - allocate and initialize the 8254 device for pio access
- * @mmio:	port I/O base address
+ * @iobase:	port I/O base address
  * @osc_base:	base time of the counter in ns
  *		OPTIONAL - only used by comedi_8254_cascade_ns_to_timer()
  * @iosize:	I/O register size
-- 
2.31.1

[PATCH 2/6] comedi: drivers: jr3_pci: Remove set but unused variable 'min_full_scale'

[Lee Jones]

Fixes the following W=1 kernel build warning(s):

 drivers/staging/comedi/drivers/jr3_pci.c: In function ‘jr3_pci_poll_subdevice’:
 drivers/staging/comedi/drivers/jr3_pci.c:507:22: warning: variable ‘min_full_scale’ set but not used [-Wunused-but-set-variable]

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
Cc: Anders Blomdell <anders.blomdell@control.lth.se>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/comedi/drivers/jr3_pci.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/comedi/drivers/jr3_pci.c b/drivers/comedi/drivers/jr3_pci.c
index 7a02c4fa3cda8..afa2f8d5c8c0c 100644
--- a/drivers/comedi/drivers/jr3_pci.c
+++ b/drivers/comedi/drivers/jr3_pci.c
@@ -504,10 +504,9 @@ jr3_pci_poll_subdevice(struct comedi_subdevice *s)
 			result = poll_delay_min_max(20, 100);
 		} else {
 			/* Set full scale */
-			struct six_axis_t min_full_scale;
 			struct six_axis_t max_full_scale;
 
-			min_full_scale = get_min_full_scales(sensor);
+			get_min_full_scales(sensor);
 			max_full_scale = get_max_full_scales(sensor);
 			set_full_scales(sensor, max_full_scale);
 
-- 
2.31.1

[PATCH 3/6] comedi: drivers: ni_tio: Fix slightly broken kernel-doc and demote others

[Lee Jones]

Fixes the following W=1 kernel build warning(s):

 drivers/staging/comedi/drivers/ni_tio.c:1515: warning: Function parameter or member 'counter_dev' not described in 'ni_tio_get_routing'
 drivers/staging/comedi/drivers/ni_tio.c:1515: warning: Function parameter or member 'dest' not described in 'ni_tio_get_routing'
 drivers/staging/comedi/drivers/ni_tio.c:1515: warning: expecting prototype for Retrieves the register value of the current source of the output selector for(). Prototype was for ni_tio_get_routing() instead
 drivers/staging/comedi/drivers/ni_tio.c:1544: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/staging/comedi/drivers/ni_tio.c:1584: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Cc: "J.P. Mellor" <jpmellor@rose-hulman.edu>
Cc: Herman.Bruyninckx@mech.kuleuven.ac.be
Cc: Wim.Meeussen@mech.kuleuven.ac.be
Cc: Klaas.Gadeyne@mech.kuleuven.ac.be
Cc: Comedi <comedi@comedi.org>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/comedi/drivers/ni_tio.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/comedi/drivers/ni_tio.c b/drivers/comedi/drivers/ni_tio.c
index f6154addaa956..da6826d77e600 100644
--- a/drivers/comedi/drivers/ni_tio.c
+++ b/drivers/comedi/drivers/ni_tio.c
@@ -1501,7 +1501,7 @@ int ni_tio_insn_config(struct comedi_device *dev,
 }
 EXPORT_SYMBOL_GPL(ni_tio_insn_config);
 
-/**
+/*
  * Retrieves the register value of the current source of the output selector for
  * the given destination.
  *
@@ -1541,10 +1541,10 @@ int ni_tio_get_routing(struct ni_gpct_device *counter_dev, unsigned int dest)
 EXPORT_SYMBOL_GPL(ni_tio_get_routing);
 
 /**
- * Sets the register value of the selector MUX for the given destination.
- * @counter_dev:Pointer to general counter device.
- * @destination:Device-global identifier of route destination.
- * @register_value:
+ * ni_tio_set_routing() - Sets the register value of the selector MUX for the given destination.
+ * @counter_dev: Pointer to general counter device.
+ * @dest:        Device-global identifier of route destination.
+ * @reg:
  *		The first several bits of this value should store the desired
  *		value to write to the register.  All other bits are for
  *		transmitting information that modify the mode of the particular
@@ -1580,7 +1580,7 @@ int ni_tio_set_routing(struct ni_gpct_device *counter_dev, unsigned int dest,
 }
 EXPORT_SYMBOL_GPL(ni_tio_set_routing);
 
-/**
+/*
  * Sets the given destination MUX to its default value or disable it.
  *
  * Return: 0 if successful; -EINVAL if terminal is unknown.
-- 
2.31.1

[PATCH 4/6] comedi: drivers: ni_routes: Demote non-conforming kernel-doc headers

[Lee Jones]

Fixes the following W=1 kernel build warning(s):

 drivers/staging/comedi/drivers/ni_routes.c:249: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/staging/comedi/drivers/ni_routes.c:398: warning: Function parameter or member 'routes' not described in 'ni_route_set_has_source'
 drivers/staging/comedi/drivers/ni_routes.c:398: warning: Function parameter or member 'source' not described in 'ni_route_set_has_source'
 drivers/staging/comedi/drivers/ni_routes.c:524: warning: Function parameter or member 'src_sel_reg_value' not described in 'ni_find_route_source'
 drivers/staging/comedi/drivers/ni_routes.c:524: warning: Function parameter or member 'dest' not described in 'ni_find_route_source'
 drivers/staging/comedi/drivers/ni_routes.c:524: warning: Function parameter or member 'tables' not described in 'ni_find_route_source'

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
Cc: "Spencer E. Olson" <olsonse@umich.edu>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/comedi/drivers/ni_routes.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/comedi/drivers/ni_routes.c b/drivers/comedi/drivers/ni_routes.c
index 1f2aa3b239a0d..f0f8cd424b309 100644
--- a/drivers/comedi/drivers/ni_routes.c
+++ b/drivers/comedi/drivers/ni_routes.c
@@ -245,7 +245,7 @@ unsigned int ni_get_valid_routes(const struct ni_route_tables *tables,
 }
 EXPORT_SYMBOL_GPL(ni_get_valid_routes);
 
-/**
+/*
  * List of NI global signal names that, as destinations, are only routeable
  * indirectly through the *_arg elements of the comedi_cmd structure.
  */
@@ -387,7 +387,7 @@ ni_find_route_set(const int destination,
 }
 EXPORT_SYMBOL_GPL(ni_find_route_set);
 
-/**
+/*
  * ni_route_set_has_source() - Determines whether the given source is in
  *			       included given route_set.
  *
@@ -506,7 +506,7 @@ s8 ni_route_to_register(const int src, const int dest,
 }
 EXPORT_SYMBOL_GPL(ni_route_to_register);
 
-/**
+/*
  * ni_find_route_source() - Finds the signal source corresponding to a signal
  *			    route (src-->dest) of the specified routing register
  *			    value and the specified route destination on the
-- 
2.31.1

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

[Lee Jones]

... 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 */
-- 
2.31.1

[PATCH 6/6] comedi: drivers: comedi_isadma: Fix misspelling of 'dma_chan1'

[Lee Jones]

Fixes the following W=1 kernel build warning(s):

 drivers/staging/comedi/drivers/comedi_isadma.c:157: warning: Function parameter or member 'dma_chan1' not described in 'comedi_isadma_alloc'
 drivers/staging/comedi/drivers/comedi_isadma.c:157: warning: Excess function parameter 'dma_chan' description in 'comedi_isadma_alloc'

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/comedi/drivers/comedi_isadma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/comedi_isadma.c b/drivers/comedi/drivers/comedi_isadma.c
index c729094298c2f..479b58e209ba6 100644
--- a/drivers/comedi/drivers/comedi_isadma.c
+++ b/drivers/comedi/drivers/comedi_isadma.c
@@ -143,7 +143,7 @@ EXPORT_SYMBOL_GPL(comedi_isadma_set_mode);
  * comedi_isadma_alloc - allocate and initialize the ISA DMA
  * @dev:	comedi_device struct
  * @n_desc:	the number of cookies to allocate
- * @dma_chan:	DMA channel for the first cookie
+ * @dma_chan1:	DMA channel for the first cookie
  * @dma_chan2:	DMA channel for the second cookie
  * @maxsize:	the size of the buffer to allocate for each cookie
  * @dma_dir:	the DMA direction
-- 
2.31.1

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

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 2907 bytes --]

Hello Lee,

On Thu, May 20, 2021 at 01:25:37PM +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/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)
> +	}
> +};

When you send this patch some time ago I wrote:

| 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.

You didn't reply to that, so maybe you missed it?

Best regards
Uwe

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

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH 2/6] comedi: drivers: jr3_pci: Remove set but unused variable 'min_full_scale'

[Ian Abbott]

On 20/05/2021 13:25, Lee Jones wrote:
> Fixes the following W=1 kernel build warning(s):
> 
>   drivers/staging/comedi/drivers/jr3_pci.c: In function ‘jr3_pci_poll_subdevice’:
>   drivers/staging/comedi/drivers/jr3_pci.c:507:22: warning: variable ‘min_full_scale’ set but not used [-Wunused-but-set-variable]
> 
> Cc: Ian Abbott <abbotti@mev.co.uk>
> Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
> Cc: Anders Blomdell <anders.blomdell@control.lth.se>
> Cc: linux-staging@lists.linux.dev
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
>   drivers/comedi/drivers/jr3_pci.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)

Actually, that one is stale now (or will be when Greg's staging-next 
branch gets merged into linux-next soon):

https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git/commit/?h=staging-next&id=b9f38e913a926b455e5048a95f53a993b515509f

| staging: comedi: Remove unused variable ‘min_full_scale’ and function 
'get_min_full_scales'
|
| The variable ‘min_full_scale’ and function 'get_min_full_scales' are
| not used, So delete them.

-- 
-=( Ian Abbott <abbotti@mev.co.uk> || MEV Ltd. is a company  )=-
-=( registered in England & Wales.  Regd. number: 02862268.  )=-
-=( Regd. addr.: S11 & 12 Building 67, Europa Business Park, )=-
-=( Bird Hall Lane, STOCKPORT, SK3 0XA, UK. || www.mev.co.uk )=-

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

[Ian Abbott]

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".

-- 
-=( Ian Abbott <abbotti@mev.co.uk> || MEV Ltd. is a company  )=-
-=( registered in England & Wales.  Regd. number: 02862268.  )=-
-=( Regd. addr.: S11 & 12 Building 67, Europa Business Park, )=-
-=( Bird Hall Lane, STOCKPORT, SK3 0XA, UK. || www.mev.co.uk )=-

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

[Lee Jones]

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?

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 2/6] comedi: drivers: jr3_pci: Remove set but unused variable 'min_full_scale'

[Lee Jones]

On Thu, 20 May 2021, Ian Abbott wrote:

> On 20/05/2021 13:25, Lee Jones wrote:
> > Fixes the following W=1 kernel build warning(s):
> > 
> >   drivers/staging/comedi/drivers/jr3_pci.c: In function ‘jr3_pci_poll_subdevice’:
> >   drivers/staging/comedi/drivers/jr3_pci.c:507:22: warning: variable ‘min_full_scale’ set but not used [-Wunused-but-set-variable]
> > 
> > Cc: Ian Abbott <abbotti@mev.co.uk>
> > Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
> > Cc: Anders Blomdell <anders.blomdell@control.lth.se>
> > Cc: linux-staging@lists.linux.dev
> > Signed-off-by: Lee Jones <lee.jones@linaro.org>
> > ---
> >   drivers/comedi/drivers/jr3_pci.c | 3 +--
> >   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> Actually, that one is stale now (or will be when Greg's staging-next branch
> gets merged into linux-next soon):
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git/commit/?h=staging-next&id=b9f38e913a926b455e5048a95f53a993b515509f
> 
> | staging: comedi: Remove unused variable ‘min_full_scale’ and function
> 'get_min_full_scales'
> |
> | The variable ‘min_full_scale’ and function 'get_min_full_scales' are
> | not used, So delete them.
> 

No worries, if it's fixed, it's fixed.

Could you please take the patches that you are happy with.

I'll rework or drop the remainder, thanks.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog

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

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 3544 bytes --]

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?

uah, maybe the first step is to not include ni_mio_common.c from other c
files. That should save some more duplicated bytes than only
range_ni_E_ao_ext ...

Best regards
Uwe

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

[-- Attachment #2: signature.asc --]
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Re: [PATCH 5/6] comedi: drivers: ni_mio_common: Move 'range_ni_E_ao_ext' to where it is used

[Dan Carpenter]

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

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

[Lee Jones]

On Fri, 21 May 2021, 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@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

I think you missed my point.

Now there are 2 options; I'd like Ian to tell me which one to implement.

> and I really doubt Uwe's will build.  :P  But Uwe is right that
> including .c files is ugly.

No one is disputing that. :)

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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Re: [PATCH 5/6] comedi: drivers: ni_mio_common: Move 'range_ni_E_ao_ext' to where it is used

[Uwe Kleine-König]

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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@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.

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

[Dan Carpenter]

On Fri, May 21, 2021 at 04:39:25PM +0200, Uwe Kleine-König wrote:
> 
> and it built for me.

You're right.  I appologize.  I thought the linker would fail if we
had the same variable in two files but I was wrong.

regards,
dan carpenter