linux-kernel - Re: [PATCH v2 2/2] MIPS: fix kernel lockup or crash after CPU offline/online

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Date:	Fri, 30 Jan 2015 09:25:14 +0000 (GMT)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Aaro Koskinen <aaro.koskinen@....fi>
cc:	Ralf Baechle <ralf@...ux-mips.org>,
	David Daney <david.daney@...ium.com>,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Hemmo Nieminen <hemmo.nieminen@....fi>, stable@...r.kernel.org
Subject: Re: [PATCH v2 2/2] MIPS: fix kernel lockup or crash after CPU
 offline/online

On Thu, 15 Jan 2015, Aaro Koskinen wrote:

> As printk() invocation can cause e.g. a TLB miss, printk() cannot be
> called before the exception handlers have been properly initialized.
> This can happen e.g. when netconsole has been loaded as a kernel module
> and the TLB table has been cleared when a CPU was offline.

 Hmm, why can a call to `printk' cause a TLB miss, what's so special about 
this function?  Does it use kernel mapped addresses for any purpose such 
as `vmalloc'?

  Maciej
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