linux-kernel - Re: [PATCH] pata_falcon: Add missing _

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Date:   Thu, 25 Nov 2021 12:09:41 +1100 (AEDT)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Michael Schmitz <schmitzmic@...il.com>
cc:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jens Axboe <axboe@...nel.dk>, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_falcon: Add missing __iomem annotations

On Wed, 24 Nov 2021, Michael Schmitz wrote:

> On 24/11/21 17:25, Finn Thain wrote:
> > The zero day bot reported some sparse complaints in pata_falcon.c. E.g.
> >
> > drivers/ata/pata_falcon.c:58:41: warning: cast removes address space
> > '__iomem' of expression
> > drivers/ata/pata_falcon.c:58:41: warning: incorrect type in argument 1
> > (different address spaces)
> > drivers/ata/pata_falcon.c:58:41:    expected unsigned short volatile
> > [noderef] [usertype] __iomem *port
> > drivers/ata/pata_falcon.c:58:41:    got unsigned short [usertype] *
> >
> > The same thing shows up in 8 places, all told. Avoid this by use of
> > __iomem type casts.
> 
> Seeing as data_addr was explicitly typed as __iomem, your fix is clearly
> correct. Bit embarrassing to have missed that (I remember adding __iomem
> annotations elsewhere at some stage).
> 
> If you think there's any need to test this change, say so.
> 

There's no change in pata_falcon.o.

> Reviewed-by: Michael Schmitz <schmitzmic@...il.com>
> 

Thanks.