linux-kernel - [PATCH v2 8/9] mips: numa: check the node id consistently for mips ip27

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Message-ID: <1567231103-13237-9-git-send-email-linyunsheng@huawei.com>
Date:   Sat, 31 Aug 2019 13:58:22 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <catalin.marinas@....com>, <will@...nel.org>, <mingo@...hat.com>,
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Subject: [PATCH v2 8/9] mips: numa: check the node id consistently for mips ip27

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 ip27 uses hub_data instead of node_to_cpumask_map,
this patch checks node id with the below case before returning
&hub_data(node)->h_cpus:
1. if node_id >= MAX_COMPACT_NODES, 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-ip27/topology.h | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/mips/include/asm/mach-ip27/topology.h b/arch/mips/include/asm/mach-ip27/topology.h
index 965f079..914a55a 100644
--- a/arch/mips/include/asm/mach-ip27/topology.h
+++ b/arch/mips/include/asm/mach-ip27/topology.h
@@ -15,9 +15,18 @@ struct cpuinfo_ip27 {
 extern struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
 
 #define cpu_to_node(cpu)	(sn_cpu_info[(cpu)].p_nodeid)
-#define cpumask_of_node(node)	((node) == -1 ?				\
-				 cpu_all_mask :				\
-				 &hub_data(node)->h_cpus)
+
+static inline const struct cpumask *cpumask_of_node(int node)
+{
+	if (node >= MAX_COMPACT_NODES)
+		return cpu_none_mask;
+
+	if (node < 0 || !hub_data(node))
+		return cpu_online_mask;
+
+	return &hub_data(node)->h_cpus;
+}
+
 struct pci_bus;
 extern int pcibus_to_node(struct pci_bus *);
 
-- 
2.8.1