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@xxxxxxxxxx> --- Note node_to_cpumask_map[node] is already a pointer, so returning &node_to_cpumask_map[node] does not seem to be correct, if this is problem, maybe clean it up in another patch. --- arch/s390/include/asm/topology.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/s390/include/asm/topology.h b/arch/s390/include/asm/topology.h index cca406f..75340ca 100644 --- a/arch/s390/include/asm/topology.h +++ b/arch/s390/include/asm/topology.h @@ -78,6 +78,12 @@ static inline int cpu_to_node(int cpu) #define cpumask_of_node cpumask_of_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]; } -- 2.8.1
