Messages in this thread | | | Subject | cpu hotplug and lockdep (was: Re: [tip:core/ipi] generic-ipi: eliminate spurious pointlessWARN_ON()s) | From | Peter Zijlstra <> | Date | Fri, 20 Mar 2009 20:34:48 +0100 |
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On Fri, 2009-03-20 at 19:52 +0100, Peter Zijlstra wrote: > On Fri, 2009-03-20 at 19:24 +0100, Ingo Molnar wrote: > > * Eric W. Biederman <ebiederm@xmission.com> wrote: > > > > > Now back to my regularly scheduled hotunplug challenges starting > > > with getting lockdep to warn about the dead locks. > > http://programming.kicks-ass.net/kernel-patches/cpu-hotplug/ > > The recursive read code needs more work..
You'll find some network softirq inversion 'fixes' there, but those are false, (soft)irq recursion isn't a problem for recursive read locks, but of course only as long as writes (and thereby all nesting exclusive locks) are irq-safe so as to not create write in read deadlocks.
Just never gotten around to actually implementing that, ego also offered to look at that at one point, but I guess he didn't get around to it either ;-)
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