linux-kernel - Re: [percpu] BUG: unable to handle kernel NULL pointer dereference at (null)

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Message-ID: <20140902171657.GG5001@linux.vnet.ibm.com>
Date:	Tue, 2 Sep 2014 10:16:57 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>,
	Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>,
	linux-kernel@...r.kernel.org
Subject: Re: [percpu] BUG: unable to handle kernel NULL pointer dereference
 at (null)

On Tue, Sep 02, 2014 at 11:55:58AM -0500, Christoph Lameter wrote:
> On Tue, 2 Sep 2014, Paul E. McKenney wrote:
> 
> > Added by ac1bea85781e (sched,rcu: Make cond_resched() report RCU quiescent
> > states), removed by 4a81e8328d379 (rcu: Reduce overhead of cond_resched()
> > checks for RCU).  So, as you say, no effect on contemporary kernels.
> 
> Well not sure what to make out of all of this....

Yep, still confused as to how the patch adding the definition could have
caused a failure.  Fengguang, any thoughts?

							Thanx, Paul

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