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Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring buffer overwrite

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring buffer overwrite
Date 2017-07-13 13:20 +0200
Message-ID <u2Kk2-4UU-23@gated-at.bofh.it> (permalink)
References (5 earlier) <u2HvP-37W-9@gated-at.bofh.it> <u2I8y-3lP-17@gated-at.bofh.it> <u2J4D-3Zi-23@gated-at.bofh.it> <u2JnY-4lu-11@gated-at.bofh.it> <u2JxE-4oH-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Jul 13, 2017 at 12:29:05PM +0200, Peter Zijlstra wrote:
> On Thu, Jul 13, 2017 at 07:09:53PM +0900, Byungchul Park wrote:
> > On Thu, Jul 13, 2017 at 11:50:52AM +0200, Peter Zijlstra wrote:
> > > 	wait_for_completion(&C);
> > > 	  atomic_inc_return();
> > > 
> > > 					mutex_lock(A1);
> > > 					mutex_unlock(A1);
> > > 
> > > 
> > > 					<IRQ>
> > > 					  spin_lock(B1);
> > > 					  spin_unlock(B1);
> > > 
> > > 					  ...
> > > 
> > > 					  spin_lock(B64);
> > > 					  spin_unlock(B64);
> > > 					</IRQ>
> > > 
> > > 

Also consider the alternative:

					<IRQ>
					  spin_lock(D);
					  spin_unlock(D);

					  complete(&C);
					</IRQ>

in which case the context test will also not work.

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Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Peter Zijlstra <peterz@infradead.org> - 2017-07-11 18:20 +0200
  Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-12 04:10 +0200
    Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Peter Zijlstra <peterz@infradead.org> - 2017-07-12 10:00 +0200
      Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-13 04:10 +0200
        Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Peter Zijlstra <peterz@infradead.org> - 2017-07-13 10:20 +0200
          Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-13 11:00 +0200
            Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Peter Zijlstra <peterz@infradead.org> - 2017-07-13 12:00 +0200
              Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-13 12:20 +0200
                Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Peter Zijlstra <peterz@infradead.org> - 2017-07-13 12:30 +0200
                Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Peter Zijlstra <peterz@infradead.org> - 2017-07-13 13:20 +0200
                Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring buffer overwrite Byungchul Park <max.byungchul.park@gmail.com> - 2017-07-13 13:30 +0200
                Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-14 03:50 +0200
                Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-14 08:50 +0200
                Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring buffer overwrite Byungchul Park <max.byungchul.park@gmail.com> - 2017-07-13 13:20 +0200
          Re: [PATCH v7 06/16] lockdep: Detect and handle hist_lock ring  buffer overwrite Byungchul Park <byungchul.park@lge.com> - 2017-07-18 03:30 +0200

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