[PATCH AUTOSEL 4.18 06/88] iommu/io-pgtable-arm: Fix pgtable allocation in selftest

[Sasha Levin]

From: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>

[ Upstream commit fac83d29d95471ad6a104f8c0d21669a3d59097b ]

Commit 4b123757eeaa ("iommu/io-pgtable-arm: Make allocations
NUMA-aware") added a NUMA hint to page table allocation, but the pgtable
selftest doesn't provide an SMMU device parameter. Since dev_to_node
doesn't accept a NULL argument, add a special case for selftest.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 drivers/iommu/io-pgtable-arm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 010a254305dd..88641b4560bc 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -237,7 +237,8 @@ static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
 	void *pages;
 
 	VM_BUG_ON((gfp & __GFP_HIGHMEM));
-	p = alloc_pages_node(dev_to_node(dev), gfp | __GFP_ZERO, order);
+	p = alloc_pages_node(dev ? dev_to_node(dev) : NUMA_NO_NODE,
+			     gfp | __GFP_ZERO, order);
 	if (!p)
 		return NULL;
 
-- 
2.17.1