linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Fix size calculation in arm_smmu_mm_invalidate

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Date:   Tue, 19 Apr 2022 16:36:47 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
        <jean-philippe@...aro.org>, <jacob.jun.pan@...ux.intel.com>,
        <baolu.lu@...ux.intel.com>, <fenghua.yu@...el.com>,
        <rikard.falkeborn@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH] iommu/arm-smmu-v3: Fix size calculation in
 arm_smmu_mm_invalidate_range()

On Tue, Apr 19, 2022 at 08:10:34PM -0300, Jason Gunthorpe wrote:

> > -     size_t size = end - start + 1;
> > +     size_t size;
> > +
> > +     /*
> > +      * The mm_types defines vm_end as the first byte after the end address,
> > +      * different from IOMMU subsystem using the last address of an address
> > +      * range. So do a simple translation here by calculating size correctly.
> > +      */
> > +     size = end - start;
> 
> I would skip the comment though

It's a bit of highlight here to help us remember in the future,
per Robin's comments at my previous patch.

Thanks!
Nic