linux-kernel - Re: [RFC PATCH 2/7] printk: Simple implementation for NMI backtracing

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Message-ID: <5510288C.3020702@linaro.org>
Date:	Mon, 23 Mar 2015 14:51:56 +0000
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Peter Zijlstra <peterz@...radead.org>,
	linux-arm-kernel@...ts.infradead.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Andrew Thoelke <andrew.thoelke@....com>,
	Dongdong Deng <dongdong.deng@...driver.com>
Subject: Re: [RFC PATCH 2/7] printk: Simple implementation for NMI backtracing

On 19/03/15 19:01, Steven Rostedt wrote:
> On Thu, 19 Mar 2015 18:48:10 +0000
> Daniel Thompson <daniel.thompson@...aro.org> wrote:
> \
>> The barrier was not intended to have anything to do with put_cpu()
>> either though since the barrier was added before put_cpu() arrived:
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=554ec063982752e9a569ab9189eeffa3d96731b2
>>
>> There's nothing in the commit comment explaining the barrier and I
>> really can't see what it is for.
>>
>
> Looks like it wasn't needed then either.

Agreed. I'll respin the patchset with the barrier removed.


Daniel.
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