[RFC] rcu: Warn that rcu ktheads cannot be spawned

From: Byungchul Park
Date: Mon Jun 24 2019 - 04:58:13 EST


Hello rcu folks,

I thought it'd better to announce it if those spawnings fail because of
!rcu_scheduler_fully_active.

Of course, with the current code, it never happens though.

Thoughts?

Thanks,
Byungchul

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