linux-kernel - Re: [RFC][PATCH 2/8] perf, arch: Use early_initcall() for all arch pmu implementations

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Date:	Fri, 26 Nov 2010 09:41:50 +0000
From:	Will Deacon <will.deacon@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Lin Ming <ming.m.lin@...el.com>,
	Stephane Eranian <eranian@...gle.com>,
	"robert.richter" <robert.richter@....com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	fweisbec <fweisbec@...il.com>, paulus <paulus@...ba.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Kyle Moffett <kyle@...fetthome.net>,
	linux-kernel@...r.kernel.org, davem <davem@...emloft.net>,
	Michael Cree <mcree@...on.net.nz>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Don Zickus <dzickus@...hat.com>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: [RFC][PATCH 2/8] perf, arch: Use early_initcall() for all arch
 pmu implementations

On Thu, 2010-11-25 at 17:55 +0000, Peter Zijlstra wrote:
> So the perf_event_init() site is _waaay_ to early to init stuff.. I
> guess I'll move it all to early_initcall() and I'll move the watchdog to
> an explicit call right after it.
> 
> Something like the below,.. now I guess the question to all of you is,
> can your arch pmu code cope with early_initcall() or does it need to be
> some other place?
> 
The ARM init code basically just parses the CPUID to work out what PMU
is available, so it should be safe to call it as early as you like.

Will


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