linux-kernel - Re: [RFC 0/9] mce recovery for Sandy Bridge server

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Date:	Tue, 24 May 2011 19:33:26 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: Re: [RFC 0/9] mce recovery for Sandy Bridge server

On Tue, May 24, 2011 at 09:57:46AM -0700, Luck, Tony wrote:
> So can we talk about this part for a while before returning to the
> "how to report this" discussion?
> 
> So here's the situation - we are in the NMI handler when we find from
> looking at the machine check bank registers that we have a recoverable
> error. We know the physical address, and we know the task (which might
> have been in user or kernel context). I can package that information
> into a perf/event ... but then how can I mark the current task as
> not-fit-for-execution?

Maybe something like

set_current_state(TASK_UNINTERRUPTIBLE);

finish work in NMI context

do remaining work in process context like sending appropriate signals
etc; finally:

set_task_state(tsk, TASK_RUNNING)

?

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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