diff options
| -rw-r--r-- | kernel/rcu/rcu.h | 9 | ||||
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
2 files changed, 10 insertions, 1 deletions
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 003671825d62..1c5cbd9d7c97 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -108,6 +108,15 @@ static inline unsigned long rcu_seq_current(unsigned long *sp) } /* + * Given a snapshot from rcu_seq_snap(), determine whether or not the + * corresponding update-side operation has started. + */ +static inline bool rcu_seq_started(unsigned long *sp, unsigned long s) +{ + return ULONG_CMP_LT((s - 1) & ~RCU_SEQ_STATE_MASK, READ_ONCE(*sp)); +} + +/* * Given a snapshot from rcu_seq_snap(), determine whether or not a * full update-side operation has occurred. */ diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 973250503d98..cbf2bcde5e60 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1583,7 +1583,7 @@ static bool rcu_start_this_gp(struct rcu_node *rnp, struct rcu_data *rdp, if (rnp_root != rnp) raw_spin_lock_rcu_node(rnp_root); if (ULONG_CMP_GE(rnp_root->gp_seq_needed, c) || - rcu_seq_done(&rnp_root->gp_seq, c) || + rcu_seq_started(&rnp_root->gp_seq, c) || (rnp != rnp_root && rcu_seq_state(rcu_seq_current(&rnp_root->gp_seq)))) { trace_rcu_this_gp(rnp_root, rdp, c, TPS("Prestarted")); |