Messages in this thread Patch in this message | | | Date | Wed, 28 Oct 2020 12:07:13 +0100 | From | Peter Zijlstra <> | Subject | [RFC][PATCH v3 6/6] rcu/tree: Use irq_work_queue_remote() |
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AFAICT we only need/use irq_work_queue_on() on remote CPUs, since we can directly access local state. So avoid the IRQ_WORK dependency and use the unconditionally available irq_work_queue_remote().
This survives a number of TREE01 runs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- kernel/rcu/tree.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
--- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1308,14 +1308,12 @@ static int rcu_implicit_dynticks_qs(stru resched_cpu(rdp->cpu); WRITE_ONCE(rdp->last_fqs_resched, jiffies); } -#ifdef CONFIG_IRQ_WORK if (!rdp->rcu_iw_pending && rdp->rcu_iw_gp_seq != rnp->gp_seq && (rnp->ffmask & rdp->grpmask)) { rdp->rcu_iw_pending = true; rdp->rcu_iw_gp_seq = rnp->gp_seq; - irq_work_queue_on(&rdp->rcu_iw, rdp->cpu); + irq_work_queue_remote(rdp->cpu, &rdp->rcu_iw); } -#endif } return 0;
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