sched: programmable: Fix build error for nr_cpus_ids

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I645C7
CVE: NA

--------------------------------

When !CONFIG_SMP && CONFIG_BPF_SCHED, it will build error, as follows:

./include/linux/cpumask.h:37:33: error: expected identifier or ‘(’ before numeric constant
   37 | #define nr_cpu_ids              1U
      |                                 ^~
./include/linux/bpf_topology.h:39:22: note: in expansion of macro ‘nr_cpu_ids’
   39 |         unsigned int nr_cpu_ids;
      |                      ^~~~~~~~~~
kernel/sched/bpf_topology.c: In function ‘____bpf_get_cpumask_info’:
./include/linux/cpumask.h:37:33: error: expected identifier before numeric constant
   37 | #define nr_cpu_ids              1U
      |                                 ^~
kernel/sched/bpf_topology.c:75:15: note: in expansion of macro ‘nr_cpu_ids’
   75 |         cpus->nr_cpu_ids = nr_cpu_ids;

Fixes: f333bd68 ("sched: programmable: Add helper function for...")
Signed-off-by: NHui Tang <tanghui20@huawei.com>

include/linux/bpf_topology.h

@@ -36,7 +36,7 @@ struct bpf_cpumask_info {
 	unsigned int nums_possible_cpus;
 	unsigned int nums_active_cpus;
 	unsigned int nums_isolate_cpus;
-	unsigned int nr_cpu_ids;
+	unsigned int bpf_nr_cpu_ids;
 	unsigned int bpf_nr_cpumask_bits;
 	struct cpumask cpu_possible_cpumask;
 	struct cpumask cpu_active_cpumask;

kernel/sched/bpf_topology.c

@@ -72,7 +72,7 @@ BPF_CALL_2(bpf_get_cpumask_info, struct bpf_map *, map, struct bpf_cpumask_info
 	cpus->nums_possible_cpus = num_possible_cpus();
 	cpus->nums_active_cpus = num_active_cpus();
 	cpus->nums_isolate_cpus = cpumask_weight(&cpus->cpu_isolate_cpumask);
-	cpus->nr_cpu_ids = nr_cpu_ids;
+	cpus->bpf_nr_cpu_ids = nr_cpu_ids;
 	cpus->bpf_nr_cpumask_bits = nr_cpumask_bits;
 
 	return 0;

tools/lib/bpf/libbpf_sched.h

@@ -310,7 +310,7 @@ static __always_inline int libbpf_nr_cpus_ids(void)
 		return -1;
 
 	bpf_get_cpumask_info(&map_cpumask_info, cpus);
-	return getVal(cpus->nr_cpu_ids);
+	return getVal(cpus->bpf_nr_cpu_ids);
 }
 
 static __always_inline int libbpf_nr_cpumask_bits(void)