arm64/numa: remove the limitation that cpu0 must bind to node0

1. Remove the old binding code.
2. Read the nid of cpu0 from dts.
3. Fallback the nid of cpu0 to 0 when numa=off is set in bootargs.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index c3c0836..8b048e6 100644 (file)
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -624,6 +624,7 @@ static void __init of_parse_and_init_cpus(void)
                        }
 
                        bootcpu_valid = true;
+                       early_map_cpu_to_node(0, of_node_to_nid(dn));
 
                        /*
                         * cpu_logical_map has already been

diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 0a15f01..778a985 100644 (file)
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -116,16 +116,24 @@ static void __init setup_node_to_cpumask_map(void)
  */
 void numa_store_cpu_info(unsigned int cpu)
 {
-       map_cpu_to_node(cpu, numa_off ? 0 : cpu_to_node_map[cpu]);
+       map_cpu_to_node(cpu, cpu_to_node_map[cpu]);
 }
 
 void __init early_map_cpu_to_node(unsigned int cpu, int nid)
 {
        /* fallback to node 0 */
-       if (nid < 0 || nid >= MAX_NUMNODES)
+       if (nid < 0 || nid >= MAX_NUMNODES || numa_off)
                nid = 0;
 
        cpu_to_node_map[cpu] = nid;
+
+       /*
+        * We should set the numa node of cpu0 as soon as possible, because it
+        * has already been set up online before. cpu_to_node(0) will soon be
+        * called.
+        */
+       if (!cpu)
+               set_cpu_numa_node(cpu, nid);
 }
 
 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
@@ -393,10 +401,6 @@ static int __init numa_init(int (*init_func)(void))
 
        setup_node_to_cpumask_map();
 
-       /* init boot processor */
-       cpu_to_node_map[0] = 0;
-       map_cpu_to_node(0, 0);
-
        return 0;
 }