linux-kernel - Re: [PATCH v2 1/3] iio: pressure: bmp280: Use uint8 to store chip ids

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Message-ID: <60fcef0b71c3b6a5a35bd2bf706af7545acc3e6a.camel@gmail.com>
Date:   Fri, 25 Aug 2023 11:28:48 +0200
From:   Angel Iglesias <ang.iglesiasg@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v2 1/3] iio: pressure: bmp280: Use uint8 to store chip
 ids

On Wed, 2023-08-23 at 19:17 +0300, Andy Shevchenko wrote:
> On Wed, Aug 23, 2023 at 07:10:33PM +0300, Andy Shevchenko wrote:
> > On Wed, Aug 23, 2023 at 05:58:05PM +0200, Angel Iglesias wrote:
> > > Represent the device id reg values using uint8 to optimize memory use.
> > 
> > This doesn't correspond to the code, in the code you used uint8_t.
> 
> ...
> 
> > >  struct bmp280_chip_info {
> > >         unsigned int id_reg;
> > > -       const unsigned int chip_id;
> > > +       uint8_t chip_id;
> > 
> > While this will compile and even work properly in kernel we use uXX types,
> > here u8.
> 
> Actually this patch doesn't optimize memory use. The alignment will create
> a gap anyway.
> 
> That said, this patch is simply redundant.
> 
OK, I'll drop it on v3 then