From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <david.ahern@oracle.com>
Date: Fri, 20 Mar 2015 02:17:37 +0000
Subject: Re: [PATCH] sparc: perf: Remove redundant perf_pmu_{en|dis}able calls
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To: sparclinux@vger.kernel.org

On 3/19/15 7:55 PM, David Miller wrote:
> I wonder why I coded it this way, maybe long ago in the past
> the caller didn't do this.

short answer: I know 2.6.39 does not need this, so it changed somewhere 
between 2.6.39 and 3.18.

 From what I can tell you used the x86 perf code as the template for 
sparc. That was roughly 2009 or 2010. The x86 code has changed a lot 
over the years; the sparc code not so much.