linux-kernel - Re: [PATCH v2 2/5] staging: iio: adc: Converted bool to bitfield format

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Message-ID: <20190324163345.GA791@peano>
Date:   Sun, 24 Mar 2019 17:33:45 +0100
From:   Sicilia Cristian <sicilia.cristian@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] staging: iio: adc: Converted bool to bitfield
 format

On Sun, Mar 24, 2019 at 12:34:52PM +0000, Jonathan Cameron wrote:
> On Sat, 23 Mar 2019 20:21:39 +0100
> Cristian Sicilia <sicilia.cristian@...il.com> wrote:
> 
 > > Changed bool format to bitfield format to save space.
> > 
> > Signed-off-by: Cristian Sicilia <sicilia.cristian@...il.com>
> > 
> > ---
> > The strange thing is that this struct seems not populated
> > using a DTS binding function.
> Indeed and that should have definitely been a warning sign ;)
> We are looking at traditional platform data here (pre device
> tree) and generally we will want to drop it entirely for old
> drivers that we are looking to move out of staging.
> 
> I don't mind improving it prior to dropping (as it avoids
> setting bad precedence in the code base in the meantime) but
> one comment inline...
> 

Thanks for comment

> > ---
> >  drivers/staging/iio/adc/ad7192.h | 16 ++++++++--------
> >  1 file changed, 8 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/staging/iio/adc/ad7192.h b/drivers/staging/iio/adc/ad7192.h
> > index 7433a43..87891ba 100644
> > --- a/drivers/staging/iio/adc/ad7192.h
> > +++ b/drivers/staging/iio/adc/ad7192.h
> > @@ -35,13 +35,13 @@ struct ad7192_platform_data {
> >  	u16		vref_mv;
> >  	u8		clock_source_sel;
> >  	u32		ext_clk_hz;
> > -	bool		refin2_en;
> > -	bool		rej60_en;
> > -	bool		sinc3_en;
> > -	bool		chop_en;
> > -	bool		buf_en;
> > -	bool		unipolar_en;
> > -	bool		burnout_curr_en;
> > -};
> > +	u8		refin2_en:1;
> > +	u8		rej60_en:1;
> > +	u8		sinc3_en:1;
> > +	u8		chop_en:1;
> > +	u8		buf_en:1;
> > +	u8		unipolar_en:1;
> > +	u8		burnout_curr_en:1;
> > +} __attribute__((__packed__));
> Please don't use packed for anything without a very very good reason.
> it may result in data layouts that are much harder to read from.
> That obviously doesn't matter here as I doubt it's read in a fast path.

Ok, I remove it, thanks

> 
> >  
> >  #endif /* IIO_ADC_AD7192_H_ */
>