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Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature
Date 2016-09-13 12:10 +0200
Message-ID <sgSP8-pv-33@gated-at.bofh.it> (permalink)
References <sgSvL-8uI-5@gated-at.bofh.it> <sgSFs-6J-17@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Sep 13, 2016 at 06:45:06PM +0900, Byungchul Park wrote:
> Crossrelease feature calls a lock 'crosslock' if it is releasable
> in any context. For crosslock, all locks having been held in the
> release context of the crosslock, until eventually the crosslock
> will be released, have dependency with the crosslock.
> 
> Using crossrelease feature, we can detect deadlock possibility even
> for lock_page(), wait_for_complete() and so on.
> 

Completely inadequate.

Please explain how cross-release does what it does. Talk about lock
graphs and such.

I do not have time to reverse engineer this stuff.

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[PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-09-13 12:00 +0200
  Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-13 12:10 +0200
    Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-13 14:20 +0200
    Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <max.byungchul.park@gmail.com> - 2016-09-13 17:20 +0200
  Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-13 17:10 +0200
    Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <max.byungchul.park@gmail.com> - 2016-09-13 19:20 +0200
      Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-13 21:40 +0200
        Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-13 23:50 +0200
          Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <max.byungchul.park@gmail.com> - 2016-09-14 03:10 +0200
        Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <max.byungchul.park@gmail.com> - 2016-09-14 04:30 +0200
          Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <max.byungchul.park@gmail.com> - 2016-09-14 06:50 +0200
          Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-14 10:20 +0200
            Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-09-19 04:50 +0200
              Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Peter Zijlstra <peterz@infradead.org> - 2016-09-19 11:00 +0200
                Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-09-20 08:10 +0200
                Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-09-20 08:40 +0200
                Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-09-21 03:50 +0200
                Re: [PATCH v3 07/15] lockdep: Implement crossrelease feature Byungchul Park <byungchul.park@lge.com> - 2016-09-22 05:10 +0200

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