linux-kernel - Re: RFC [PATCH] SMP: Don't schedule tasks on inactive cpu(s)

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Message-ID: <1330513384.11248.129.camel@twins>
Date:	Wed, 29 Feb 2012 12:03:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jonas Aaberg <jonas.aberg@...ricsson.com>
Cc:	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFC [PATCH] SMP: Don't schedule tasks on inactive cpu(s)

On Wed, 2012-02-29 at 11:42 +0100, Jonas Aaberg wrote:
> This patch removes the ability to schedule tasks on cpus that are online,
> but not active.  The reason for this patch is that during cpu hotplug
> on ARM (atleast) there is a short window where cpuX (X > 0) is online, but
> busy-waiting on cpu0 to put it active, meanwhile cpu0 can be interrupted
> and try to schedule something on the cpu that is busy checking its active bit.

https://lkml.org/lkml/2011/12/15/255

that one?

I _think_ its correct, but it would be so good if someone else could
verify.
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