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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-04-27 14:05:27 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-12 15:38:59 -0700 |
| commit | c74859d1eb2d8578bdf6d78ba893e394085aba1a (patch) | |
| tree | 17e12f56714e9567ea66307fc582abd06f523dd6 /kernel/rcu | |
| parent | rcu: Make rcu_init_new_rnp() stop upon already-set bit (diff) | |
| download | linux-dev-c74859d1eb2d8578bdf6d78ba893e394085aba1a.tar.xz linux-dev-c74859d1eb2d8578bdf6d78ba893e394085aba1a.zip | |
rcu: Make rcu_report_unblock_qs_rnp() warn on violated preconditions
If rcu_report_unblock_qs_rnp() is invoked on something other than
preemptible RCU or if there are still preempted tasks blocking the
current grace period, something went badly wrong in the caller.
This commit therefore adds WARN_ON_ONCE() to these conditions, but
leaving the legitimate reason for early exit (rnp->qsmask != 0)
unwarned.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 3fe854a15d82..85417584ffd0 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -2308,8 +2308,10 @@ static void rcu_report_unblock_qs_rnp(struct rcu_state *rsp, struct rcu_node *rnp_p; raw_lockdep_assert_held_rcu_node(rnp); - if (rcu_state_p == &rcu_sched_state || rsp != rcu_state_p || - rnp->qsmask != 0 || rcu_preempt_blocked_readers_cgp(rnp)) { + if (WARN_ON_ONCE(rcu_state_p == &rcu_sched_state) || + WARN_ON_ONCE(rsp != rcu_state_p) || + WARN_ON_ONCE(rcu_preempt_blocked_readers_cgp(rnp)) || + rnp->qsmask != 0) { raw_spin_unlock_irqrestore_rcu_node(rnp, flags); return; /* Still need more quiescent states! */ } |