linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier

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Date:   Fri, 10 Dec 2021 09:54:59 +0000
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Rikard Falkeborn <rikard.falkeborn@...il.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Eric Auger <eric.auger@...hat.com>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier_ops

On Sat, Dec 04, 2021 at 11:33:01PM +0100, Rikard Falkeborn wrote:
> The only usage of arm_smmu_mmu_notifier_ops is to assign its address to
> the ops field in the mmu_notifier struct, which is a pointer to const
> struct mmu_notifier_ops. Make it const to allow the compiler to put it
> in read-only memory.
> 
> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@...aro.org>

> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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 ee66d1f4cb81..a737ba5f727e 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> @@ -220,7 +220,7 @@ static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
>  	kfree(mn_to_smmu(mn));
>  }
>  
> -static struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
> +static const struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
>  	.invalidate_range	= arm_smmu_mm_invalidate_range,
>  	.release		= arm_smmu_mm_release,
>  	.free_notifier		= arm_smmu_mmu_notifier_free,
> -- 
> 2.34.1
>