linux-kernel - Re: [PATCH 4/4] iio: pressure: Add triggered buffer support for BMP280 driver

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Date: Mon, 4 Mar 2024 21:18:27 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Vasileios Amoiridis <vassilisamir@...il.com>
Cc: jic23@...nel.org, lars@...afoo.de, ang.iglesiasg@...il.com,
	mazziesaccount@...il.com, ak@...klinger.de,
	petre.rodan@...dimension.ro, phil@...pberrypi.com, 579lpy@...il.com,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] iio: pressure: Add triggered buffer support for
 BMP280 driver

On Mon, Mar 04, 2024 at 08:08:38PM +0100, Vasileios Amoiridis wrote:
> On Mon, Mar 04, 2024 at 01:52:05PM +0200, Andy Shevchenko wrote:
> > On Sun, Mar 03, 2024 at 05:53:00PM +0100, Vasileios Amoiridis wrote:

..

> > > +	struct {
> > > +		s32 temperature;
> > > +		u32 pressure;
> > > +		u32 humidity;
> > 
> > > +		s64 timestamp;
> > 
> > Shouldn't this be aligned properly?
> 
> I saw that in some drivers it was added and in some it was not. What is the
> difference of aligning just the timestamp of the kernel?

You can count yourself. With provided structure as above there is a high
probability of misaligned timeout field. The latter has to be aligned on
8 bytes.

> > > +	} iio_buffer;

-- 
With Best Regards,
Andy Shevchenko