linux-kernel - Re: [PATCH 2/4] context_tracking: Inherit TIF_NOHZ through forks instead of context switches

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Message-ID: <20150422153553.GD3007@worktop.Skamania.guest>
Date:	Wed, 22 Apr 2015 17:35:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	Ingo Molnar <mingo@...nel.org>, Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 2/4] context_tracking: Inherit TIF_NOHZ through forks
 instead of context switches

On Tue, Apr 21, 2015 at 11:06:04PM +0200, Frederic Weisbecker wrote:
> 
> Because I need the tick nohz intialization to be after irq initialization (init_IRQ()),
> which it depends on.

OK, that's all _way_ before rest_init() which does the very first
fork().

I think we can safely put a WARN in there.
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