linux-kernel - [PATCH v2 9/9] mips: numa: check the node id consistently for mips loongson64

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Date:   Sat, 31 Aug 2019 13:58:23 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <catalin.marinas@....com>, <will@...nel.org>, <mingo@...hat.com>,
        <bp@...en8.de>, <rth@...ddle.net>, <ink@...assic.park.msu.ru>,
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Subject: [PATCH v2 9/9] mips: numa: check the node id consistently for mips loongson64

According to Section 6.2.14 from ACPI spec 6.3 [1], the setting
of proximity domain is optional, as below:

This optional object is used to describe proximity domain
associations within a machine. _PXM evaluates to an integer
that identifies a device as belonging to a Proximity Domain
defined in the System Resource Affinity Table (SRAT).

Since mips loongson64 uses __node_data instead of
node_to_cpumask_map, this patch checks node id with the below
case before returning &__node_data[node]->cpumask:
1. if node_id >= MAX_NUMNODES, return cpu_none_mask
2. if node_id < 0, return cpu_online_mask
3. if hub_data(node) is NULL, return cpu_online_mask

[1] https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 arch/mips/include/asm/mach-loongson64/topology.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/mach-loongson64/topology.h b/arch/mips/include/asm/mach-loongson64/topology.h
index 7ff819a..b19b983 100644
--- a/arch/mips/include/asm/mach-loongson64/topology.h
+++ b/arch/mips/include/asm/mach-loongson64/topology.h
@@ -5,7 +5,17 @@
 #ifdef CONFIG_NUMA
 
 #define cpu_to_node(cpu)	(cpu_logical_map(cpu) >> 2)
-#define cpumask_of_node(node)	(&__node_data[(node)]->cpumask)
+
+static inline const struct cpumask *cpumask_of_node(int node)
+{
+	if (node >= MAX_NUMNODES)
+		return cpu_none_mask;
+
+	if (node < 0 || !__node_data[node])
+		return cpu_online_mask;
+
+	return &__node_data[node]->cpumask;
+}
 
 struct pci_bus;
 extern int pcibus_to_node(struct pci_bus *);
-- 
2.8.1