Re: [PATCH] iommu/mediatek: fix out-of-range warning with clang

2021-09-28 Thread Joerg Roedel
On Mon, Sep 27, 2021 at 02:18:44PM +0200, Arnd Bergmann wrote:
>  drivers/iommu/mtk_iommu.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Applied, thanks.

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Re: [PATCH] iommu/mediatek: fix out-of-range warning with clang

2021-09-27 Thread Yong Wu
On Mon, 2021-09-27 at 14:18 +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann 
> 
> clang-14 notices that a comparison is never true when
> CONFIG_PHYS_ADDR_T_64BIT is disabled:
> 
> drivers/iommu/mtk_iommu.c:553:34: error: result of comparison of
> constant 5368709120 with expression of type 'phys_addr_t' (aka
> 'unsigned int') is always false [-Werror,-Wtautological-constant-out-
> of-range-compare]
> if (dom->data->enable_4GB && pa >=
> MTK_IOMMU_4GB_MODE_REMAP_BASE)
>  ~~
> ^  ~
> 
> Add an explicit check for the type of the variable to skip the check
> and the warning in that case.
> 
> Fixes: b4dad40e4f35 ("iommu/mediatek: Adjust the PA for the 4GB
> Mode")
> Signed-off-by: Arnd Bergmann 

Reviewed-by: Yong Wu 

Thanks.
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[PATCH] iommu/mediatek: fix out-of-range warning with clang

2021-09-27 Thread Arnd Bergmann
From: Arnd Bergmann 

clang-14 notices that a comparison is never true when
CONFIG_PHYS_ADDR_T_64BIT is disabled:

drivers/iommu/mtk_iommu.c:553:34: error: result of comparison of constant 
5368709120 with expression of type 'phys_addr_t' (aka 'unsigned int') is always 
false [-Werror,-Wtautological-constant-out-of-range-compare]
if (dom->data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE)
 ~~ ^  ~

Add an explicit check for the type of the variable to skip the check
and the warning in that case.

Fixes: b4dad40e4f35 ("iommu/mediatek: Adjust the PA for the 4GB Mode")
Signed-off-by: Arnd Bergmann 
---
 drivers/iommu/mtk_iommu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index d837adfd1da5..25b834104790 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -550,7 +550,9 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct 
iommu_domain *domain,
phys_addr_t pa;
 
pa = dom->iop->iova_to_phys(dom->iop, iova);
-   if (dom->data->enable_4GB && pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE)
+   if (IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT) &&
+   dom->data->enable_4GB &&
+   pa >= MTK_IOMMU_4GB_MODE_REMAP_BASE)
pa &= ~BIT_ULL(32);
 
return pa;
-- 
2.29.2

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