Re: [Outreachy kernel] Re: [PATCH] Staging: iio: adc: Added Space around binary op.

From	Julia Lawall <julia.lawall@lip6.fr>
Newsgroups	linux.kernel
Subject	Re: [Outreachy kernel] Re: [PATCH] Staging: iio: adc: Added Space around binary op.
Date	2017-09-08 12:10 +0200
Message-ID	<unooy-5ko-11@gated-at.bofh.it> (permalink)
References	<unjoR-1Us-1@gated-at.bofh.it> <unkXE-2YQ-7@gated-at.bofh.it> <unnVw-4Ss-11@gated-at.bofh.it> <unnVw-4Ss-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw


On Fri, 8 Sep 2017, Lars-Peter Clausen wrote:

> On 09/08/2017 11:32 AM, Jonathan Cameron wrote:
> > On Fri, 8 Sep 2017 07:29:06 +0100
> > Jonathan Cameron <jic23@jic23.retrosnub.co.uk> wrote:
> >
> >> On 8 September 2017 05:47:52 BST, Himanshi Jain <himshijain.hj@gmail.com> wrote:
> >>> Added space around(one on each side of) binary
> >>> operator(-) as preferred according to kernel
> >>> coding style.
> >>>
> >>> Signed-off-by: Himanshi Jain <himshijain.hj@gmail.com>
> >>
> >> Take a closer look at that macro. It isn't doing what you think...
> >> To give a hint, changing this breaks userspace.
> >
> > Ok, I'm bored of this particular one coming up. When you have
> > worked out what is going on Himanshi, would you mind putting
> > together a patch adding a comment describing why it is a bad
> > idea to 'fix' this?  That would be a very useful patch as
> > far as I'm concerned :)
> >
> > There aren't that many cases of this in IIO so adding a comment
> > on each of them is probably reasonable just to avoid wasting
> > people's time on fixing them! (I think we have had more than
> > 5 such goes this year so far...)
> >
>
> I'd much rather fix this API so that you have to put "" around the name so
> that it is clear that it is a string, rather than doing the implicit
> conversion to string using preprocessor magic. Better to have a
> self-documenting API then having to add a comment to each user of the API.

All the DEVICE_ATTR macros use the same strategy.  And the non-IIO ones,
eg DEVICE_ATTR_RW, also use the provided name to construct the names of
the show and store functions, so I don't think a string would be
appropriate.

julia

>
> > Jonathan
> >
> >>
> >> Jonathan
> >>
> >>
> >>> ---
> >>> 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 d11c6de..1aee662 100644
> >>> --- a/drivers/staging/iio/adc/ad7192.c
> >>> +++ b/drivers/staging/iio/adc/ad7192.c
> >>> @@ -341,7 +341,7 @@ static int ad7192_setup(struct ad7192_state *st,
> >>> }
> >>>
> >>> 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,
> >>
> >
>
> --
> You received this message because you are subscribed to the Google Groups "outreachy-kernel" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com.
> To post to this group, send email to outreachy-kernel@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/2e3476f0-9e7e-2701-220a-5fb178d68d2e%40metafoo.de.
> For more options, visit https://groups.google.com/d/optout.
>

Thread

[PATCH] Staging: iio: adc: Added Space around binary op. Himanshi Jain <himshijain.hj@gmail.com> - 2017-09-08 06:50 +0200
  Re: [Outreachy kernel] [PATCH] Staging: iio: adc: Added Space around  binary op. Julia Lawall <julia.lawall@lip6.fr> - 2017-09-08 08:10 +0200
  Re: [PATCH] Staging: iio: adc: Added Space around binary op. Jonathan Cameron <jic23@jic23.retrosnub.co.uk> - 2017-09-08 08:30 +0200
    Re: [PATCH] Staging: iio: adc: Added Space around binary op. Lars-Peter Clausen <lars@metafoo.de> - 2017-09-08 11:40 +0200
      Re: [PATCH] Staging: iio: adc: Added Space around binary op. Jonathan Cameron <Jonathan.Cameron@huawei.com> - 2017-09-08 11:50 +0200
      Re: [Outreachy kernel] Re: [PATCH] Staging: iio: adc: Added Space  around binary op. Julia Lawall <julia.lawall@lip6.fr> - 2017-09-08 12:10 +0200
        Re: [Outreachy kernel] Re: [PATCH] Staging: iio: adc: Added Space  around binary op. Lars-Peter Clausen <lars@metafoo.de> - 2017-09-08 12:20 +0200
          Re: [Outreachy kernel] Re: [PATCH] Staging: iio: adc: Added Space  around binary op. Julia Lawall <julia.lawall@lip6.fr> - 2017-09-08 12:40 +0200
    Re: [PATCH] Staging: iio: adc: Added Space around binary op. Jonathan Cameron <Jonathan.Cameron@huawei.com> - 2017-09-08 11:40 +0200

csiph-web