tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.03.20b head: 6d4434b4b4df791620743178e1419de882b44c7b commit: d0f41d341df0520e900cac03de05bbbd11abdcd9 [59/83] rcu: Enable elimination of Tree-RCU softirq processing config: i386-randconfig-x002-201911 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout d0f41d341df0520e900cac03de05bbbd11abdcd9 # save the attached .config to linux build tree make ARCH=i386
Note: the rcu/dev.2019.03.20b HEAD 6d4434b4b4df791620743178e1419de882b44c7b
builds fine.
It only hurts bisectibility.
All errors (new ones prefixed by >>):
In file included from kernel/rcu/tree.c:3489:0:
kernel/rcu/tree_plugin.h: In function 'rcu_read_unlock_special':
>> kernel/rcu/tree_plugin.h:612:8: error: 'rcu_softirq_enabled' undeclared
>> (first use in this function); did you mean 'trace_softirqs_enabled'?
if (rcu_softirq_enabled)
^~~~~~~~~~~~~~~~~~~
trace_softirqs_enabled
kernel/rcu/tree_plugin.h:612:8: note: each undeclared identifier is reported
only once for each function it appears in
vim +612 kernel/rcu/tree_plugin.h
588
589 /*
590 * Handle special cases during rcu_read_unlock(), such as needing to
591 * notify RCU core processing or task having blocked during the RCU
592 * read-side critical section.
593 */
594 static void rcu_read_unlock_special(struct task_struct *t)
595 {
596 unsigned long flags;
597 bool preempt_bh_were_disabled =
598 !!(preempt_count() & (PREEMPT_MASK |
SOFTIRQ_MASK));
599 bool irqs_were_disabled;
600
601 /* NMI handlers cannot block and cannot safely manipulate
state. */
602 if (in_nmi())
603 return;
604
605 local_irq_save(flags);
606 irqs_were_disabled = irqs_disabled_flags(flags);
607 if (preempt_bh_were_disabled || irqs_were_disabled) {
608 WRITE_ONCE(t->rcu_read_unlock_special.b.exp_hint,
false);
609 /* Need to defer quiescent state until everything is
enabled. */
610 if (irqs_were_disabled) {
611 /* Enabling irqs does not reschedule, so... */
> 612 if (rcu_softirq_enabled)
613 raise_softirq_irqoff(RCU_SOFTIRQ);
614 else
615 invoke_rcu_core();
616 } else {
617 /* Enabling BH or preempt does reschedule,
so... */
618 set_tsk_need_resched(current);
619 set_preempt_need_resched();
620 }
621 local_irq_restore(flags);
622 return;
623 }
624 WRITE_ONCE(t->rcu_read_unlock_special.b.exp_hint, false);
625 rcu_preempt_deferred_qs_irqrestore(t, flags);
626 }
627
---
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.config.gz
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