linux-kernel - Re: [PATCH 04/23] perf, x86: Add copy_from_user_nmi

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Message-ID: <20120627151903.GH20638@somewhere.redhat.com>
Date:	Wed, 27 Jun 2012 17:19:06 +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 04/23] perf, x86: Add copy_from_user_nmi_nochk for best
 effort copy

On Tue, Jun 19, 2012 at 05:47:55PM +0200, Jiri Olsa wrote:
> Adding copy_from_user_nmi_nochk that provides the best effort
> copy regardless the size crossing the task boundary at the moment.

The changelog needs more info about this. Why are we removing this check?

> 
> This is going to be useful for stack dump we need in post
> DWARF CFI based unwind.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
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