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Re: Interesting csd deadlock on ARC

From Vineet Gupta <Vineet.Gupta1@synopsys.com>
Newsgroups linux.kernel
Subject Re: Interesting csd deadlock on ARC
Date 2016-02-24 05:50 +0100
Message-ID <r5zyH-7GA-45@gated-at.bofh.it> (permalink)
References (1 earlier) <r5dHQ-Cg-3@gated-at.bofh.it> <r5hV8-3st-11@gated-at.bofh.it> <r5ioa-3Vb-9@gated-at.bofh.it> <r5iHw-42n-15@gated-at.bofh.it> <r5kpY-5q1-17@gated-at.bofh.it>
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On Tuesday 23 February 2016 04:28 PM, Noam Camus wrote:
>> From: Peter Zijlstra [mailto:peterz@infradead.org] 
>> Sent: Tuesday, February 23, 2016 12:40 PM
> 
>> The only requirement for irq_work is that it runs after the NMI completes and runs from regular IRQ context. >There are no strict interrupt priority requirements, only that it happens.
> 
> We here already use self IPI and irq_work on ARC (with no NMI concerns).
> Please see patch at:
> https://github.com/EZchip/linux/commit/e42556738e610295f917c79dae166373cd11de88

So this relies on 2nd level intc providing the IPI.
For UP we still need the software triggered interrupt provided by core intc.

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Thread

Re: Interesting csd deadlock on ARC Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-02-23 06:30 +0100
  Re: Interesting csd deadlock on ARC Peter Zijlstra <peterz@infradead.org> - 2016-02-23 11:00 +0100
    Re: Interesting csd deadlock on ARC Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-02-23 11:30 +0100
      Re: Interesting csd deadlock on ARC Peter Zijlstra <peterz@infradead.org> - 2016-02-23 11:50 +0100
        RE: Interesting csd deadlock on ARC Noam Camus <noamca@mellanox.com> - 2016-02-23 13:40 +0100
          Re: Interesting csd deadlock on ARC Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-02-24 05:50 +0100
    Re: Interesting csd deadlock on ARC Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-02-24 06:00 +0100
      Re: Interesting csd deadlock on ARC Peter Zijlstra <peterz@infradead.org> - 2016-02-25 15:10 +0100
        Re: Interesting csd deadlock on ARC Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-02-25 15:30 +0100
          Re: Interesting csd deadlock on ARC Russell King - ARM Linux <linux@arm.linux.org.uk> - 2016-02-25 15:40 +0100
            Re: Interesting csd deadlock on ARC Vineet Gupta <vgupta@synopsys.com> - 2016-02-25 17:00 +0100

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