linux-kernel - Re: [PATCH v4 3/3] iommu: dart: Add DART iommu driver

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Message-ID: <YOxJRw9H08pwnRgc@maud>
Date:   Mon, 12 Jul 2021 09:53:11 -0400
From:   Alyssa Rosenzweig <alyssa@...labora.com>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Arnd Bergmann <arnd@...nel.org>, devicetree@...r.kernel.org,
        Hector Martin <marcan@...can.st>, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Petr Mladek via iommu <iommu@...ts.linux-foundation.org>,
        Alexander Graf <graf@...zon.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Rouven Czerwinski <r.czerwinski@...gutronix.de>
Subject: Re: [PATCH v4 3/3] iommu: dart: Add DART iommu driver

> > Should we be checking alignment here? Something like
> > 
> >     BUG_ON(paddr & ((1 << DART_TTBR_SHIFT) - 1));
> > 
> 
> Sure, right now paddr will always be aligned but adding that
> BUG_ON doesn't hurt :)

Probably should have suggested WARN_ON instead of BUG_ON but yes.