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

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Message-ID: <50531151.9020202@gmail.com>
Date:	Fri, 14 Sep 2012 05:13:21 -0600
From:	David Ahern <dsahern@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	peterz@...radead.org, Robert Richter <robert.richter@....com>
Subject: Re: [PATCH 3/3 v2] perf tool: give user better message if precise
 is not supported

On 9/13/12 11:43 PM, Ingo Molnar wrote:
>> v2: softened message to 'may not be' supported per Robert's suggestion
>
> Well, either it's supported on this machine or it's not - why
> does the text have to be so unsure about it?

Because EOPNOTSUPP is returned for more than just precise mode. We 
cannot say with certainty that the precise attribute caused that errno.

David


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