linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Align size in __arm_smmu_tlb_inv

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Message-ID: <Yl8WF9R7tubSgREw@Asurada-Nvidia>
Date:   Tue, 19 Apr 2022 13:05:43 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     Robin Murphy <robin.murphy@....com>, <will@...nel.org>,
        <joro@...tes.org>, <thunder.leizhen@...wei.com>,
        <tglx@...utronix.de>, <john.garry@...wei.com>,
        <jean-philippe@...aro.org>, <christophe.jaillet@...adoo.fr>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iommu/arm-smmu-v3: Align size in __arm_smmu_tlb_inv_range

On Tue, Apr 19, 2022 at 05:02:33PM -0300, Jason Gunthorpe wrote:

> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > index d816759a6bcf..e280568bb513 100644
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > @@ -183,7 +183,7 @@ static void arm_smmu_mm_invalidate_range(struct mmu_notifier *mn,
> >  {
> >         struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
> >         struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
> > -       size_t size = end - start + 1;
> > +       size_t size = end - start;
> 
> +1 to this bug fix. You should send a formal patch for stable with a fixes/etc
> 
> mmu notifiers uses 'end' not 'last' in alignment with how VMA's work:
> 
> include/linux/mm_types.h:       unsigned long vm_end;           /* The first byte after our end address

Thanks for the review!

Yea, I will send a new patch.

Nic