[PATCH v3 7/7] s390/sparsemem: provide memory_add_physaddr_to_nid() with CONFIG_NUMA

[David Hildenbrand <david@redhat.com>]

virtio-mem uses memory_add_physaddr_to_nid() to determine the NID to use
for memory it adds.

We currently fallback to the dummy implementation in mm/numa.c with
CONFIG_NUMA, which will end up triggering an undesired pr_info_once():

	Unknown online node for memory at 0x100000000, assuming node 0

On s390, we map all cpus and memory to node 0, so let's add a simple
memory_add_physaddr_to_nid() implementation that does exactly that,
but without complaining.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/s390/include/asm/sparsemem.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/s390/include/asm/sparsemem.h b/arch/s390/include/asm/sparsemem.h
index ff628c50afac..6377b7ea8a40 100644
--- a/arch/s390/include/asm/sparsemem.h
+++ b/arch/s390/include/asm/sparsemem.h
@@ -5,4 +5,12 @@
 #define SECTION_SIZE_BITS	27
 #define MAX_PHYSMEM_BITS	CONFIG_MAX_PHYSMEM_BITS
 
+#ifdef CONFIG_NUMA
+static inline int memory_add_physaddr_to_nid(u64 addr)
+{
+	return 0;
+}
+#define memory_add_physaddr_to_nid memory_add_physaddr_to_nid
+#endif /* CONFIG_NUMA */
+
 #endif /* _ASM_S390_SPARSEMEM_H */
-- 
2.46.1