linux-kernel - [PATCH v2 3/4] MIPS: Loongson: Make cpumask_of_node() robust against NUMA_NO

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Message-ID: <20260107094007.966496-4-john.g.garry@oracle.com>
Date: Wed,  7 Jan 2026 09:40:06 +0000
From: John Garry <john.g.garry@...cle.com>
To: chenhuacai@...nel.org, kernel@...0n.name, jiaxun.yang@...goat.com,
        tsbogend@...ha.franken.de, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        luto@...nel.org, peterz@...radead.org, arnd@...db.de, x86@...nel.org
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-arch@...r.kernel.org,
        vulab@...as.ac.cn, gregkh@...uxfoundation.org, rafael@...nel.org,
        dakr@...nel.org, John Garry <john.g.garry@...cle.com>
Subject: [PATCH v2 3/4] MIPS: Loongson: Make cpumask_of_node() robust against NUMA_NO_NODE

The arch definition of cpumask_of_node() cannot handle NUMA_NO_NODE - which
is a valid index - so add a check for this.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 arch/mips/include/asm/mach-loongson64/topology.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/mach-loongson64/topology.h b/arch/mips/include/asm/mach-loongson64/topology.h
index 3414a1fd17835..89bb4deab98a6 100644
--- a/arch/mips/include/asm/mach-loongson64/topology.h
+++ b/arch/mips/include/asm/mach-loongson64/topology.h
@@ -7,7 +7,7 @@
 #define cpu_to_node(cpu)	(cpu_logical_map(cpu) >> 2)
 
 extern cpumask_t __node_cpumask[];
-#define cpumask_of_node(node)	(&__node_cpumask[node])
+#define cpumask_of_node(node)	  ((node) == NUMA_NO_NODE ? cpu_all_mask : &__node_cpumask[node])
 
 struct pci_bus;
 extern int pcibus_to_node(struct pci_bus *);
-- 
2.43.5