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>

1 files changed, 10 insertions, 6 deletions

diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 0a15f010b64a..778a985c8a70 100644
--- 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;
 }