This patch submission got completely screwed up, sorry, please ignore. I'll repost soon. There's something messed up with my SMTP server too.
On Tue, May 15, 2018 at 03:45:54PM -0700, Joel Fernandes (Google) wrote: > I'm able to reproduce a lockdep splat with config options: > CONFIG_PROVE_LOCKING=y, > CONFIG_DEBUG_LOCK_ALLOC=y and > CONFIG_PREEMPTIRQ_EVENTS=y > > $ echo 1 > /d/tracing/events/preemptirq/preempt_enable/enable > --- > kernel/softirq.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/kernel/softirq.c b/kernel/softirq.c > index 177de3640c78..8a040bcaa033 100644 > --- a/kernel/softirq.c > +++ b/kernel/softirq.c > @@ -139,9 +139,13 @@ static void __local_bh_enable(unsigned int cnt) > { > lockdep_assert_irqs_disabled(); > > + if (preempt_count() == cnt) > + trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip()); > + > if (softirq_count() == (cnt & SOFTIRQ_MASK)) > trace_softirqs_on(_RET_IP_); > - preempt_count_sub(cnt); > + > + __preempt_count_sub(cnt); > } > > /* > -- > 2.17.0.441.gb46fe60e1d-goog >