linux-kernel - Re: Creating tasks on restart: userspace vs kernel

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Message-ID: <20090414164623.GF27461@x200.localdomain>
Date:	Tue, 14 Apr 2009 20:46:23 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	containers@...ts.osdl.org, Dave Hansen <dave@...ux.vnet.ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Creating tasks on restart: userspace vs kernel

> 1) somebody should write registers before final jump to userspace.
>    Task itself can't generally do it: struct pt_regs is in the same place
>    as kernel stack.
> 
>    cr_load_cpu_regs() does exactly this: as current writes to it's own
>    pt_regs. Oren, why don't you see crashes?
> 
>    I first tried to do it and was greeted with horrible crashes because
>    e.g current becoming NULL under current. That's why 
>    cr_arch_restore_task_struct() is not done in current context.

Hmm, this must an artefact of kernel_thread() approach.
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