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List: linux-rt-users
Subject: Re: [ANNOUNCE] v5.10-rc1-rt1
From: Mike Galbraith <efault () gmx ! de>
Date: 2020-10-29 4:37:44
Message-ID: 0945ac2959a7ef04f5b3eeaa28b71261c7ccfeb2.camel () gmx ! de
[Download RAW message or body]
"blk-mq: Use llist_head for blk_cpu_done" needs a minor adjustment, as
is it induces much grumbling...
BUG: using smp_processor_id() in preemptible [00000000] code: usb-storage/479
@@ -657,6 +621,7 @@ static inline bool blk_mq_complete_need_
bool blk_mq_complete_request_remote(struct request *rq)
{
+ struct llist_head *cpu_list;
WRITE_ONCE(rq->state, MQ_RQ_COMPLETE);
/*
@@ -667,14 +632,21 @@ bool blk_mq_complete_request_remote(stru
return false;
if (blk_mq_complete_need_ipi(rq)) {
- rq->csd.func = __blk_mq_complete_request_remote;
- rq->csd.info = rq;
- rq->csd.flags = 0;
- smp_call_function_single_async(rq->mq_ctx->cpu, &rq->csd);
+ unsigned int cpu;
+
+ cpu = rq->mq_ctx->cpu;
+ cpu_list = &per_cpu(blk_cpu_done, cpu);
+ if (llist_add(&rq->ipi_list, cpu_list)) {
+ rq->csd.func = __blk_mq_complete_request_remote;
+ rq->csd.flags = 0;
+ smp_call_function_single_async(cpu, &rq->csd);
+ }
} else {
if (rq->q->nr_hw_queues > 1)
return false;
- blk_mq_trigger_softirq(rq);
+ cpu_list = this_cpu_ptr(&blk_cpu_done); <== there
+ if (llist_add(&rq->ipi_list, cpu_list))
+ raise_softirq(BLOCK_SOFTIRQ);
}
return true;
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