linux-kernel - Re: [PATCH 4/8] iio: chemical: pms7003: use aligned

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Message-ID: <2ac349c8dd9b7fcc86e2caae1f74943c23289921.camel@gmail.com>
Date: Fri, 18 Apr 2025 09:51:37 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>, David Lechner
	 <dlechner@...libre.com>
Cc: Jonathan Cameron <jic23@...nel.org>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, Lars-Peter Clausen
 <lars@...afoo.de>,  Michael Hennerich <Michael.Hennerich@...log.com>,
 Cosmin Tanislav <cosmin.tanislav@...log.com>, Tomasz Duszynski
 <tduszyns@...il.com>, Jean-Baptiste Maneyrol
 <jean-baptiste.maneyrol@....com>,  Andreas Klinger <ak@...klinger.de>,
 Petre Rodan <petre.rodan@...dimension.ro>,  linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org,  linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 4/8] iio: chemical: pms7003: use aligned_s64 for
 timestamp

On Thu, 2025-04-17 at 18:35 +0100, Jonathan Cameron wrote:
> On Thu, 17 Apr 2025 11:52:36 -0500
> David Lechner <dlechner@...libre.com> wrote:
> 
> > Follow the pattern of other drivers and use aligned_s64 for the
> > timestamp. This will ensure that the timestamp is correctly aligned on
> > all architectures.
> > 
> > Also move the unaligned.h header while touching this since it was the
> > only one not in alphabetical order.
> > 
> > Signed-off-by: David Lechner <dlechner@...libre.com>
> > ---
> >  drivers/iio/chemical/pms7003.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/iio/chemical/pms7003.c b/drivers/iio/chemical/pms7003.c
> > index
> > d0bd94912e0a3492641acd955adbc2184f4a11b3..e05ce1f12065c65d14b66ab86e291fab47805de
> > c 100644
> > --- a/drivers/iio/chemical/pms7003.c
> > +++ b/drivers/iio/chemical/pms7003.c
> > @@ -5,7 +5,6 @@
> >   * Copyright (c) Tomasz Duszynski <tduszyns@...il.com>
> >   */
> >  
> > -#include <linux/unaligned.h>
> >  #include <linux/completion.h>
> >  #include <linux/device.h>
> >  #include <linux/errno.h>
> > @@ -19,6 +18,8 @@
> >  #include <linux/module.h>
> >  #include <linux/mutex.h>
> >  #include <linux/serdev.h>
> > +#include <linux/types.h>
> > +#include <linux/unaligned.h>
> >  
> >  #define PMS7003_DRIVER_NAME "pms7003"
> >  
> > @@ -76,7 +77,7 @@ struct pms7003_state {
> >  	/* Used to construct scan to push to the IIO buffer */
> >  	struct {
> >  		u16 data[3]; /* PM1, PM2P5, PM10 */
> > -		s64 ts;
> > +		aligned_s64 ts;
> 
> Bug I think..  So another one that really needs a fixes tag.
> For all these we might be lucky with padding on the allocations
> but we shouldn't really rely on that.

Agreed... We're likely not that lucky for x86-32

- Nuno Sá
> 
> >  	} scan;
> >  };
> >  
> > 
>