Re: [PATCH 2/7] sched: Fix picking a task switching on other cpu (__ARCH_WANT_UNLOCKED_CTXSW)

[Peter Zijlstra]

On Sat, Sep 20, 2014 at 08:51:22PM +0400, Kirill Tkhai wrote:
> From: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>
> 
> 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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