[v2,4/9] powerpc: numa: check the node id consistently for powerpc
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Message ID 1567231103-13237-5-git-send-email-linyunsheng@huawei.com
State New
Headers show
Series
  • check the node id consistently across different arches
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Commit Message

Yunsheng Lin Aug. 31, 2019, 5:58 a.m. UTC
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
node_to_cpumask_map[node]:
1. if node_id >= nr_node_ids, return cpu_none_mask
2. if node_id < 0, return cpu_online_mask
3. if node_to_cpumask_map[node_id] 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@huawei.com>
---
 arch/powerpc/include/asm/topology.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

Patch
diff mbox series

diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 2f7e1ea..217dc9b 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -17,9 +17,16 @@  struct device_node;
 
 #include <asm/mmzone.h>
 
-#define cpumask_of_node(node) ((node) == -1 ?				\
-			       cpu_all_mask :				\
-			       node_to_cpumask_map[node])
+static inline const struct cpumask *cpumask_of_node(int node)
+{
+	if (node >= nr_node_ids)
+		return cpu_none_mask;
+
+	if (node < 0 || !node_to_cpumask_map[node])
+		return cpu_online_mask;
+
+	return node_to_cpumask_map[node];
+}
 
 struct pci_bus;
 #ifdef CONFIG_PCI