[PATCH] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier_ops

[PATCH] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier_ops

[Rikard Falkeborn]

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@gmail.com>
---
 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


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Re: [PATCH] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier_ops

[Jean-Philippe Brucker]

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@gmail.com>

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

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Re: [PATCH] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier_ops

[Will Deacon]

On Sat, 4 Dec 2021 23:33:01 +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.
> 
> 

Applied to will (for-joerg/arm-smmu/updates), thanks!

[1/1] iommu/arm-smmu-v3: Constify arm_smmu_mmu_notifier_ops
      https://git.kernel.org/will/c/17d9a4b43b28

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev

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