Messages in this thread | | | Date | Tue, 29 Jun 2021 10:35:49 +0200 | From | Daniel Wagner <> | Subject | Re: [PATCH 1/1] block: System crashes when cpu hotplug + bouncing port |
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On Tue, Jun 29, 2021 at 10:25:43AM +0200, Daniel Wagner wrote: > On Tue, Jun 29, 2021 at 11:47:55AM +0800, Ming Lei wrote: > > > >>data.ctx = __blk_mq_get_ctx(q, cpu); > > > cpu=2048 if hctx_idx = 4 > > > > Yeah, that is the issue I mentioned, any CPU in hctx->cpumask becomes > > offline, please try the following patch and see if it makes a > > difference: > > Given that cpumask_first_and() will return nr_cpu_ids in this case, > can't we just bail out here and have to caller handle the error?
To answer my own question, you want to avoid adding the if into the hotpath.
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