linux-kernel - [PATCH v3 7/7] s390/sparsemem: provide memory_add_physaddr_to_nid() with CONFIG

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Message-ID: <20241025141453.1210600-8-david@redhat.com>
Date: Fri, 25 Oct 2024 16:14:52 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	linux-s390@...r.kernel.org,
	virtualization@...ts.linux.dev,
	linux-doc@...r.kernel.org,
	kvm@...r.kernel.org,
	David Hildenbrand <david@...hat.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Thomas Huth <thuth@...hat.com>,
	Cornelia Huck <cohuck@...hat.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Eric Farman <farman@...ux.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>
Subject: [PATCH v3 7/7] s390/sparsemem: provide memory_add_physaddr_to_nid() with CONFIG_NUMA

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@...hat.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