linux-kernel - Re: [PATCH 3/3 v2] perf tool: give user better message if precise is not supported

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Date:	Fri, 14 Sep 2012 20:07:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org,
	Robert Richter <robert.richter@....com>
Subject: Re: [PATCH 3/3 v2] perf tool: give user better message if precise
 is not supported

On Fri, 2012-09-14 at 11:00 -0700, Arnaldo Carvalho de Melo wrote:
> > Understood and there have been suggestions on how to definitely state
> > what the kernel side did not like. I like Peter's last suggestion --
> > something along the lines of clearing attr on a failure except the
> > offending setting.
> 
> I think ws need to use a new bit 

Quite so, for all the reasons you list. But you like the general idea? I
wasn't sure I did, but it was the only thing I could come up with that
would sort of do what we need it to.

The fact that you destroy the user input is awkward, I don't think
there's another syscall that behaves in this fashion.
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