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Re: sched: serial port lockdep warning when offlining CPUs

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: sched: serial port lockdep warning when offlining CPUs
Date 2017-09-28 14:10 +0200
Message-ID <uuFND-nv-1@gated-at.bofh.it> (permalink)
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On Thu, Sep 28, 2017 at 11:45:30AM +0000, Levin, Alexander (Sasha Levin) wrote:
> Okay, that seems to have delt with the callbacks supressed issue.
> 
> I also seem to be hitting it as a result of the scheduler triggering a
> WARN, where print_stack_trace(), for example, just uses printk().
> 
> Now I'm not sure what's your approach here, do we keep converting
> printk to printk_deferred one by one until we whacked every mole?

Nah.. WARN's _should_ not trigger. If they do we fix that.

Getting a lockdep splat after a WARN is something I can live with.

And you really don't want that deferred nonsense for WARNs, because that
means you'll risk not over getting the output.

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Thread

sched: serial port lockdep warning when offlining CPUs Sasha Levin <levinsasha928@gmail.com> - 2017-09-28 11:30 +0200
  Re: sched: serial port lockdep warning when offlining CPUs Peter Zijlstra <peterz@infradead.org> - 2017-09-28 11:40 +0200
    Re: sched: serial port lockdep warning when offlining CPUs Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-09-28 12:40 +0200
      Re: sched: serial port lockdep warning when offlining CPUs Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-09-28 13:40 +0200
        Re: sched: serial port lockdep warning when offlining CPUs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-28 14:00 +0200
          Re: sched: serial port lockdep warning when offlining CPUs Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-09-28 14:00 +0200
          Re: sched: serial port lockdep warning when offlining CPUs Peter Zijlstra <peterz@infradead.org> - 2017-09-28 14:10 +0200
            Re: sched: serial port lockdep warning when offlining CPUs Peter Zijlstra <peterz@infradead.org> - 2017-09-28 14:10 +0200
              Re: sched: serial port lockdep warning when offlining CPUs Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-09-28 14:20 +0200
                Re: sched: serial port lockdep warning when offlining CPUs Peter Zijlstra <peterz@infradead.org> - 2017-09-28 14:30 +0200
      Re: sched: serial port lockdep warning when offlining CPUs Peter Zijlstra <peterz@infradead.org> - 2017-09-28 13:50 +0200
        Re: sched: serial port lockdep warning when offlining CPUs Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-09-28 14:00 +0200
    Re: sched: serial port lockdep warning when offlining CPUs "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com> - 2017-09-28 13:10 +0200
      Re: sched: serial port lockdep warning when offlining CPUs Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2017-09-28 13:20 +0200
        Re: sched: serial port lockdep warning when offlining CPUs Peter Zijlstra <peterz@infradead.org> - 2017-09-28 13:40 +0200

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