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Message-ID: <4111500E.90304@kolivas.org>
Date: Thu, 05 Aug 2004 07:07:26 +1000
From: Con Kolivas <kernel@kolivas.org>
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To: Zwane Mwaikambo <zwane@linuxpower.ca>
Cc: Nathan Lynch <nathanl@austin.ibm.com>,
       Dipankar Sarma <dipankar@in.ibm.com>, V Srivatsa <vatsa@in.ibm.com>,
       Joel Schopp <jschopp@austin.ibm.com>,
       Rusty Russell <rusty@rustcorp.com.au>,
       lkml <linux-kernel@vger.kernel.org>,
       Nick Piggin <nickpiggin@yahoo.com.au>
Subject: Re: CPU hotplug broken in 2.6.8-rc2 ?
References: <20040802094907.GA3945@in.ibm.com>  <20040802095741.GA4599@in.ibm.com>  <1091475519.29556.4.camel@pants.austin.ibm.com>  <1091478386.29556.36.camel@pants.austin.ibm.com> <1091567239.28036.36.camel@biclops.private.network> <Pine.LNX.4.58.0408041048350.19619@montezuma.fsmlabs.com>
In-Reply-To: <Pine.LNX.4.58.0408041048350.19619@montezuma.fsmlabs.com>
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Zwane Mwaikambo wrote:
> On Tue, 3 Aug 2004, Nathan Lynch wrote:
> 
> 
>>                __setscheduler(rq->idle, SCHED_NORMAL, 0);
>>                task_rq_unlock(rq, &flags);
>>                BUG_ON(rq->nr_running != 0);
>>
>>I can reproduce this on both ppc64 and i386.  Does anyone know why this
>>is happening?
>>
>>If I remove the BUG_ON, things seem to go ok, but I doubt that's the
>>right thing to do.
> 
> 
> It could have something to do with the staircase scheduler, Con, got any
> wise words?

Doesn't this bug report say 2.6.8-rc2? It's mm2 that has staircase.

Con

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