[RFC 3/3] sparse-vmemmap: let vmemmap_verify() ignore NUMA_NO_NODE requests

[Nicolai Stange <nicstange@gmail.com>]

On x86, Kasan's initizalization in arch/x86/mm/kasan_init_64.c calls
vmemmap_populate() and thus, since commit 7b79d10a2d64 ("mm: convert
kmalloc_section_memmap() to populate_section_memmap()"),
vmemmap_populate_basepages() with a node value of NUMA_NO_NODE.

Since a page's actual NUMA node is never equal to NUMA_NO_NODE, this
results in excessive warnings from vmemmap_verify():

  [ffffed00179c6e00-ffffed00179c7dff] potential offnode page_structs
  [ffffed00179c7e00-ffffed00179c8dff] potential offnode page_structs
  [ffffed00179c8e00-ffffed00179c9dff] potential offnode page_structs
  [ffffed00179c9e00-ffffed00179cadff] potential offnode page_structs
  [ffffed00179cae00-ffffed00179cbdff] potential offnode page_structs
  [...]

Make vmemmap_verify() return early if the requested node equals
NUMA_NO_NODE.

Signed-off-by: Nicolai Stange <nicstange@gmail.com>
---
 mm/sparse-vmemmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index f08872b58e48..e38aaf6c312c 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -165,6 +165,9 @@ void __meminit vmemmap_verify(pte_t *pte, int node,
 	unsigned long pfn = pte_pfn(*pte);
 	int actual_node = early_pfn_to_nid(pfn);
 
+	if (node == NUMA_NO_NODE)
+		return;
+
 	if (node_distance(actual_node, node) > LOCAL_DISTANCE)
 		pr_warn("[%lx-%lx] potential offnode page_structs\n",
 			start, end - 1);
-- 
2.11.1

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