linux-kernel - Re: [RFC 2/3] arm64: refactor save_stack

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Message-Id: <D7BD8A9F-8710-42D5-A0ED-8747D2B6B268@gmail.com>
Date:	Tue, 4 Aug 2015 01:30:50 +0900
From:	Jungseok Lee <jungseoklee85@...il.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"david.griego@...aro.org" <david.griego@...aro.org>,
	"olof@...om.net" <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC 2/3] arm64: refactor save_stack_trace()

On Aug 3, 2015, at 6:09 PM, Will Deacon wrote:
> Hi guys,

Hi Will,

> On Mon, Jul 20, 2015 at 05:20:04PM +0100, Will Deacon wrote:
>> On Fri, Jul 17, 2015 at 04:34:21PM +0100, Jungseok Lee wrote:
>>> On Jul 17, 2015, at 11:59 PM, Jungseok Lee wrote:
>>>> On Jul 17, 2015, at 11:41 PM, Steven Rostedt wrote:
>>>>> Thanks! Can you repost patch 1 with the changes I recommended, so that
>>>>> I can get an Acked-by from the arm64 maintainers and pull all the
>>>>> changes in together. This is fine for a 4.3 release, right? That is, it
>>>>> doesn't need to go into 4.2-rcs.
>>>>> 
>>>> 
>>>> It's not hard to repost a patch, but I feel like we have to wait for Akashi's response.
>>>> Also, it might be needed to consider Mark's comment on arch part.
>>>> 
>>>> If they are okay, I will proceed.
>>> 
>>> The [RFC 1/3] patch used in my environment is shaped as follows.
>>> I leave the hunk for *only* clear synchronization. This is why I choose this format
>>> instead of reposting a patch. I hope it would help to track down this thread.
>>> 
>>> I think this is my best at this point.
> 
> [...]
> 
>> The arm64 bits look fine to me:
>> 
>>  Acked-by: Will Deacon <will.deacon@....com>
> 
> What happened to this? Is it queued someplace, or are we waiting for a
> new version?

There are two issues in the current version.
1) The change does not work correctly when function_graph feature is enabled.
2) Akashi have raised an issue that size field of stack tracer is inaccurate.

So, I think this patch set is not ready yet.

Best Regards
Jungseok Lee--
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