1 files changed, 16 insertions, 0 deletions

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index fbe544761628..a411fc17d265 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -301,6 +301,22 @@ const struct bpf_func_proto bpf_spin_unlock_proto = {
         .arg1_type      = ARG_PTR_TO_SPIN_LOCK,
 };
 
+void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
+                           bool lock_src)
+{
+        struct bpf_spin_lock *lock;
+
+        if (lock_src)
+                lock = src + map->spin_lock_off;
+        else
+                lock = dst + map->spin_lock_off;
+        preempt_disable();
+        ____bpf_spin_lock(lock);
+        copy_map_value(map, dst, src);
+        ____bpf_spin_unlock(lock);
+        preempt_enable();
+}
+
 #ifdef CONFIG_CGROUPS
 BPF_CALL_0(bpf_get_current_cgroup_id)
 {