linux-kernel - Re: [v5][PATCH 6/6] book3e/kgdb: Fix a single stgep case of lazy IRQ

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Date:	Wed, 23 Oct 2013 17:28:12 +0800
From:	"“tiejun.chen”" 
	<tiejun.chen@...driver.com>
To:	Scott Wood <scottwood@...escale.com>
CC:	<benh@...nel.crashing.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [v5][PATCH 6/6] book3e/kgdb: Fix a single stgep case of lazy
 IRQ

On 10/19/2013 07:32 AM, Scott Wood wrote:
> On Thu, 2013-06-20 at 18:28 +0800, Tiejun Chen wrote:
>> When we're in kgdb_singlestep(), we have to work around to get
>> thread_info by copying from the kernel stack before calling
>> kgdb_handle_exception(), then copying it back afterwards.
>>
>> But for PPC64, we have a lazy interrupt implementation. So after
>> copying thread info frome kernle stack, if we need to replay an
>> interrupt, we shouldn't restore that previous backup thread info
>> to make sure we can replay an interrupt lately with a proper
>> thread info.
>
> Explain why copying it would be a problem.
>

This would be gone away in next version as well :)

Thanks,

Tiejun

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