2017-12-28 02:49:35

by ji-hun Kim

Subject: [PATCH 2/2] staging: iio: add spaces around '-' operator

Clean up checkpatch warning:
CHECK: spaces preferred around that '-' (ctx:VxV)

Signed-off-by: Ji-Hun Kim <[email protected]>
---
drivers/staging/iio/adc/ad7192.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
index f015955..c4eff71 100644
--- a/drivers/staging/iio/adc/ad7192.c
+++ b/drivers/staging/iio/adc/ad7192.c
@@ -340,7 +340,7 @@ ad7192_show_scale_available(struct device *dev,
}

static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
- in_voltage-voltage_scale_available,
+ in_voltage - voltage_scale_available,
0444, ad7192_show_scale_available, NULL, 0);

static IIO_DEVICE_ATTR(in_voltage_scale_available, 0444,
--
2.10.1 (Apple Git-78)

2017-12-28 06:07:21

by Julia Lawall

Subject: Re: [PATCH 2/2] staging: iio: add spaces around '-' operator

On Wed, 27 Dec 2017, Ji-Hun Kim wrote:

> Clean up checkpatch warning:
> CHECK: spaces preferred around that '-' (ctx:VxV)
>
> Signed-off-by: Ji-Hun Kim <[email protected]>
> ---
> drivers/staging/iio/adc/ad7192.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
> index f015955..c4eff71 100644
> --- a/drivers/staging/iio/adc/ad7192.c
> +++ b/drivers/staging/iio/adc/ad7192.c
> @@ -340,7 +340,7 @@ ad7192_show_scale_available(struct device *dev,
> }
>
> static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
> - in_voltage-voltage_scale_available,
> + in_voltage - voltage_scale_available,

I think this has been discussed at length before, and it is a hyphen not a
subtraction. IIO_DEVICE_ATTR_NAMED is a macro, as indicated by the
capital letters, and you have to look and see what the code expands into.

julia

> 0444, ad7192_show_scale_available, NULL, 0);
>
> static IIO_DEVICE_ATTR(in_voltage_scale_available, 0444,
> --
> 2.10.1 (Apple Git-78)
>
> --
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2017-12-29 12:07:15

by Jonathan Cameron

Subject: Re: [PATCH 2/2] staging: iio: add spaces around '-' operator

On Thu, 28 Dec 2017 07:07:17 +0100 (CET)
Julia Lawall <[email protected]> wrote:

> On Wed, 27 Dec 2017, Ji-Hun Kim wrote:
>
> > Clean up checkpatch warning:
> > CHECK: spaces preferred around that '-' (ctx:VxV)
> >
> > Signed-off-by: Ji-Hun Kim <[email protected]>
> > ---
> > drivers/staging/iio/adc/ad7192.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
> > index f015955..c4eff71 100644
> > --- a/drivers/staging/iio/adc/ad7192.c
> > +++ b/drivers/staging/iio/adc/ad7192.c
> > @@ -340,7 +340,7 @@ ad7192_show_scale_available(struct device *dev,
> > }
> >
> > static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
> > - in_voltage-voltage_scale_available,
> > + in_voltage - voltage_scale_available,
>
> I think this has been discussed at length before, and it is a hyphen not a
> subtraction. IIO_DEVICE_ATTR_NAMED is a macro, as indicated by the
> capital letters, and you have to look and see what the code expands into.

Technically it is a subtraction, but the symbol rather than the c operator ;)
It's indicating that this sysfs attribute is referring to any
voltage channels minus other voltage channels (differential channels).

Sometimes I wonder if we should leave this there for ever as a way of
getting people to understand that they need to look really closely
at what checkpatch is suggesting and not assume it is right.

Jonathan

>
> julia
>
> > 0444, ad7192_show_scale_available, NULL, 0);
> >
> > static IIO_DEVICE_ATTR(in_voltage_scale_available, 0444,
> > --
> > 2.10.1 (Apple Git-78)
> >
> > --
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> > the body of a message to [email protected]
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> >
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