[PATCH v2] xen/iommu: smmu: Silence clang in arm_smmu_device_dt_probe()

[Julien Grall <julien@xxxxxxx>]

From: Julien Grall <jgrall@xxxxxxxxxx>

Clang 11 will throw the following error:

smmu.c:2284:18: error: cast to smaller integer type 'enum 
arm_smmu_arch_version' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]
        smmu->version = (enum arm_smmu_arch_version)of_id->data;
                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The error can be prevented by initially casting to (uintptr_t) and then
enum.

Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>

---

Changes in v2:
    - Cast to (uintptr_t) rather than introduce separate pointer
    (requested by Andrew).

Only build tested
---
 xen/drivers/passthrough/arm/smmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/arm/smmu.c 
b/xen/drivers/passthrough/arm/smmu.c
index 20ac672e91b6..fab7be8b48bb 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2382,7 +2382,7 @@ static int arm_smmu_device_dt_probe(struct 
platform_device *pdev)
        smmu->dev = dev;
 
        of_id = of_match_node(arm_smmu_of_match, dev->of_node);
-       smmu->version = (enum arm_smmu_arch_version)of_id->data;
+       smmu->version = (enum arm_smmu_arch_version)(uintptr_t)of_id->data;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        smmu->base = devm_ioremap_resource(dev, res);
-- 
2.17.1