linux-kernel - Re: [PATCH 03/17] perf, x86: Add copy_from_user_nmi

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Message-ID: <20120725161150.GA1173@somewhere.redhat.com>
Date:	Wed, 25 Jul 2012 18:11:53 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, eranian@...gle.com,
	gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com,
	robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 03/17] perf, x86: Add copy_from_user_nmi_nochk for best
 effort copy

On Sun, Jul 22, 2012 at 02:14:26PM +0200, Jiri Olsa wrote:
> Adding copy_from_user_nmi_nochk that provides the best effort
> copy regardless the requesting size crossing the task boundary.
> 
> This is going to be useful for stack dump we need in post
> DWARF CFI based unwind, where we have predefined size of
> the user stack to dump, and we need to store the most of
> the requested dump size, regardless this size is crossing
> the task boundary.

What does that imply when we cross this limit? Are we still in the
task stack?
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