[PATCH] cxl/test: Map mock device nodes to an online node

cxl_mem_init() assigns alternating NUMA nodes to the mock memdevs
to model multi-node topologies. On a single-node host node 1 has
no pgdat, and the first node-aware allocation in an odd device's
probe faults on a NULL zonelist:

  Oops: general protection fault, probably for non-canonical address 0xdffffc00000006e3
  KASAN: probably user-memory-access in range [0x0000000000003718-0x000000000000371f]
  Workqueue: async async_run_entry_fn
  RIP: __alloc_frozen_pages_noprof+0x288
   new_slab
   ___slab_alloc
   __kmalloc_node_track_caller_noprof
   devm_kmalloc
   cxl_mock_mem_probe

Map the requested node to an online one, as dax_hmem already does
for its target node.

Fixes: cf1f6877b088 ("cxl/memdev: Add numa_node attribute")
Fixes: e41c8452b9b2 ("tools/testing/cxl: Add a single-port host-bridge regression config")
Fixes: c9435dbee119 ("tools/testing/cxl: Add an RCH topology")
Signed-off-by: Davidlohr Bueso <[email protected]>
---
Found while regression testing unrelated work.

 tools/testing/cxl/test/cxl.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index ef92dd35e030..5156516a82d2 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -1748,7 +1748,7 @@ static int cxl_mem_init(void)
 		if (!pdev)
 			goto err_mem;
 		pdev->dev.parent = &dport->dev;
-		set_dev_node(&pdev->dev, i % 2);
+		set_dev_node(&pdev->dev, numa_map_to_online_node(i % 2));
 
 		rc = cxl_mock_platform_device_add(pdev, &cxl_mem[i]);
 		if (rc)
@@ -1763,7 +1763,7 @@ static int cxl_mem_init(void)
 		if (!pdev)
 			goto err_single;
 		pdev->dev.parent = &dport->dev;
-		set_dev_node(&pdev->dev, i % 2);
+		set_dev_node(&pdev->dev, numa_map_to_online_node(i % 2));
 
 		rc = cxl_mock_platform_device_add(pdev, &cxl_mem_single[i]);
 		if (rc)
@@ -1779,7 +1779,7 @@ static int cxl_mem_init(void)
 		if (!pdev)
 			goto err_rcd;
 		pdev->dev.parent = &rch->dev;
-		set_dev_node(&pdev->dev, i % 2);
+		set_dev_node(&pdev->dev, numa_map_to_online_node(i % 2));
 
 		rc = cxl_mock_platform_device_add(pdev, &cxl_rcd[i]);
 		if (rc)
-- 
2.39.5