linux-kernel - [PATCH v2 7/9] sparc64: numa: check the node id consistently for sparc64

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Date:   Sat, 31 Aug 2019 13:58:21 +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 7/9] sparc64: numa: check the node id consistently for sparc64

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).

This patch checks node id with the below case before returning
&numa_cpumask_lookup_table[node]:
1. if node_id >= nr_node_ids, return cpu_none_mask
2. if node_id < 0, return cpu_online_mask
3. Since numa_cpumask_lookup_table is not a pointer, a comment
   is added to indicate that

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

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 arch/sparc/include/asm/topology_64.h | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/sparc/include/asm/topology_64.h b/arch/sparc/include/asm/topology_64.h
index 34c628a..66a7917 100644
--- a/arch/sparc/include/asm/topology_64.h
+++ b/arch/sparc/include/asm/topology_64.h
@@ -11,9 +11,19 @@ static inline int cpu_to_node(int cpu)
 	return numa_cpu_lookup_table[cpu];
 }
 
-#define cpumask_of_node(node) ((node) == -1 ?				\
-			       cpu_all_mask :				\
-			       &numa_cpumask_lookup_table[node])
+static inline const struct cpumask *cpumask_of_node(int node)
+{
+	if (node >= MAX_NUMNODES)
+		return cpu_none_mask;
+
+	/* numa_cpumask_lookup_table[node] is not a pointer, so
+	 * no need to check for NULL here.
+	 */
+	if (node < 0)
+		return cpu_online_mask;
+
+	return &numa_cpumask_lookup_table[node];
+}
 
 struct pci_bus;
 #ifdef CONFIG_PCI
-- 
2.8.1