diff options
Diffstat (limited to 'kernel/bpf/memalloc.c')
| -rw-r--r-- | kernel/bpf/memalloc.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c index 04d96d1b98a3..ebcc3dd0fa19 100644 --- a/kernel/bpf/memalloc.c +++ b/kernel/bpf/memalloc.c @@ -464,9 +464,17 @@ static void free_mem_alloc(struct bpf_mem_alloc *ma) { /* waiting_for_gp lists was drained, but __free_rcu might * still execute. Wait for it now before we freeing percpu caches. + * + * rcu_barrier_tasks_trace() doesn't imply synchronize_rcu_tasks_trace(), + * but rcu_barrier_tasks_trace() and rcu_barrier() below are only used + * to wait for the pending __free_rcu_tasks_trace() and __free_rcu(), + * so if call_rcu(head, __free_rcu) is skipped due to + * rcu_trace_implies_rcu_gp(), it will be OK to skip rcu_barrier() by + * using rcu_trace_implies_rcu_gp() as well. */ rcu_barrier_tasks_trace(); - rcu_barrier(); + if (!rcu_trace_implies_rcu_gp()) + rcu_barrier(); free_mem_alloc_no_barrier(ma); } |