linux-kernel - Re: [PATCH v2 18/19] ARC: [plat-eznps] replace sync with proper cpu barrier

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Date:	Tue, 17 Nov 2015 18:07:08 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<gilf@...hip.com>, <talz@...hip.com>,
	<linux-kernel@...r.kernel.org>, <cmetcalf@...hip.com>,
	Noam Camus <noamc@...hip.com>,
	<linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v2 18/19] ARC: [plat-eznps] replace sync with proper cpu
 barrier

On Tuesday 17 November 2015 05:52 PM, Peter Zijlstra wrote:
>> > BTW since we are on the topic we have this loop in stack unwinder which can
>> > potentially cause RCU stalls, actual lockups etc. I was planning to add the
>> > following - does that seem fine to you.
> Worries me more than anything. How could you get stuck in there?

No we not getting stuck in there - but this has potential to - if say unwind info
were corrupt (not seen that ever though).

The old code won't even respond to say a Ctrl+C if it were stuck !
Plus the reschedule there will keeps sched happy when say unraveling deep stack
frames with perf ?


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