The following patch adds a test for NUMA-aware CPU enumerators, and it requires an access to sched_domains_numa_levels. Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx> --- include/linux/topology.h | 7 +++++++ kernel/sched/topology.c | 10 ++++++---- 2 files changed, 13 insertions(+), 4 deletions(-) diff --git a/include/linux/topology.h b/include/linux/topology.h index 62a9dd8edd77..3d8d486c817d 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -43,6 +43,13 @@ for_each_online_node(node) \ if (nr_cpus_node(node)) +#ifdef CONFIG_NUMA +extern int __sched_domains_numa_levels; +#define sched_domains_numa_levels ((const int)__sched_domains_numa_levels) +#else +#define sched_domains_numa_levels (1) +#endif + int arch_update_cpu_topology(void); /* Conform to ACPI 2.0 SLIT distance definitions */ diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 1860d9487fe1..5f5f994a56da 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1508,7 +1508,9 @@ static void claim_allocations(int cpu, struct sched_domain *sd) #ifdef CONFIG_NUMA enum numa_topology_type sched_numa_topology_type; -static int sched_domains_numa_levels; +int __sched_domains_numa_levels; +EXPORT_SYMBOL_GPL(__sched_domains_numa_levels); + static int sched_domains_curr_level; int sched_max_numa_distance; @@ -1872,7 +1874,7 @@ void sched_init_numa(int offline_node) * * We reset it to 'nr_levels' at the end of this function. */ - sched_domains_numa_levels = 0; + __sched_domains_numa_levels = 0; masks = kzalloc(sizeof(void *) * nr_levels, GFP_KERNEL); if (!masks) @@ -1948,7 +1950,7 @@ void sched_init_numa(int offline_node) sched_domain_topology_saved = sched_domain_topology; sched_domain_topology = tl; - sched_domains_numa_levels = nr_levels; + __sched_domains_numa_levels = nr_levels; WRITE_ONCE(sched_max_numa_distance, sched_domains_numa_distance[nr_levels - 1]); init_numa_topology_type(offline_node); @@ -1961,7 +1963,7 @@ static void sched_reset_numa(void) struct cpumask ***masks; nr_levels = sched_domains_numa_levels; - sched_domains_numa_levels = 0; + __sched_domains_numa_levels = 0; sched_max_numa_distance = 0; sched_numa_topology_type = NUMA_DIRECT; distances = sched_domains_numa_distance; -- 2.34.1
