iommu/io-pgtable-arm: Avoid warning with 32-bit phys_addr_t

It's not entirely unreasonable for io-pgtable-arm to be built for
configurations with 32-bit phys_addr_t, where the compiler rightly
raises a warning about the 36-bit shift. That particular code path
should never actually *run* on those systems, but we still want it
to compile cleanly, which is easily done by using an unambiguous u64
as the intermediate type instead.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index a5be4c9..47b64d3 100644 (file)
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -211,7 +211,7 @@ static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
 static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
                                  struct arm_lpae_io_pgtable *data)
 {
-       phys_addr_t paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
+       u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
 
        if (data->pg_shift < 16)
                return paddr;