linux-kernel - Re: [PATCH 2/7] sched: Fix picking a task switching on other cpu (__ARCH_WANT_UNLOCKED

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Message-ID: <20140920183326.GT2832@worktop.localdomain>
Date:	Sat, 20 Sep 2014 20:33:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Kirill Tkhai <ktkhai@...allels.com>
Subject: Re: [PATCH 2/7] sched: Fix picking a task switching on other cpu
 (__ARCH_WANT_UNLOCKED_CTXSW)

On Sat, Sep 20, 2014 at 08:51:22PM +0400, Kirill Tkhai wrote:
> From: Kirill Tkhai <ktkhai@...allels.com>
> 
> We may pick a task which is in context_switch() on other cpu at the moment.
> Parallel using of a single stack by two processes is not a good idea.

Please elaborate on who exactly that might happen. Its best to have
comprehensive changelogs for issues that fix races.
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