linux-kernel - [PATCH v4 23/26] of, numa: return -EINVAL when no numa-node-id is found

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Message-ID: <20240807064110.1003856-24-rppt@kernel.org>
Date: Wed,  7 Aug 2024 09:41:07 +0300
From: Mike Rapoport <rppt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>,
	Andreas Larsson <andreas@...sler.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
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	Catalin Marinas <catalin.marinas@....com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Dan Williams <dan.j.williams@...el.com>,
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	David Hildenbrand <david@...hat.com>,
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	devicetree@...r.kernel.org,
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	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v4 23/26] of, numa: return -EINVAL when no numa-node-id is found

From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>

Currently of_numa_parse_memory_nodes() returns 0 if no "memory" node in
device tree contains "numa-node-id" property. This makes of_numa_init()
to return "success" despite no NUMA nodes were actually parsed and set
up.

arch_numa workarounds this by returning an error if numa_nodes_parsed is
empty.

numa_memblks however would WARN() in such case and since it will be used
by arch_numa shortly, such warning is not desirable.

Make sure of_numa_init() returns -EINVAL when no NUMA node information
was found in the device tree.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Tested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com> [arm64 + CXL via QEMU]
Acked-by: Dan Williams <dan.j.williams@...el.com>
Acked-by: David Hildenbrand <david@...hat.com>
---
 drivers/of/of_numa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
index 838747e319a2..2ec20886d176 100644
--- a/drivers/of/of_numa.c
+++ b/drivers/of/of_numa.c
@@ -45,7 +45,7 @@ static int __init of_numa_parse_memory_nodes(void)
 	struct device_node *np = NULL;
 	struct resource rsrc;
 	u32 nid;
-	int i, r;
+	int i, r = -EINVAL;
 
 	for_each_node_by_type(np, "memory") {
 		r = of_property_read_u32(np, "numa-node-id", &nid);
@@ -72,7 +72,7 @@ static int __init of_numa_parse_memory_nodes(void)
 		}
 	}
 
-	return 0;
+	return r;
 }
 
 static int __init of_numa_parse_distance_map_v1(struct device_node *map)
-- 
2.43.0