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

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Message-ID: <alpine.DEB.2.11.1409021052400.10607@gentwo.org>
Date:	Tue, 2 Sep 2014 11:00:12 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.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, 2 Sep 2014, Paul E. McKenney wrote:

> Before this commit, raw_cpu_add_return() didn't build.  The commit
> didn't affect anything else.
>
> So I don't understand how anything could work before this commit and
> be broken after it.  Enlightenment?

Where is that raw_cpu_add_return statement?

grep does not match anything like that in kernel/rcu/*
and this_cpu_add_return is used extensively in the network subsystem for
statistics.
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