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SubjectRe: [PATCH 1/1] block: System crashes when cpu hotplug + bouncing port
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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