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

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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 <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Robin Murphy 2018-03-29 12:24:52 +01:00 • committed by Joerg Roedel
commit 7868805969
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/io-pgtable-arm.c
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@ -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;