linux-kernel - Re: [PATCH] arm64: ftrace: stop using kstop

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Date:	Fri, 4 Dec 2015 09:00:40 +0800
From:	libin <huawei.libin@...wei.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Will Deacon <will.deacon@....com>
CC:	<mingo@...hat.com>, <catalin.marinas@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>,
	<dingtianhong@...wei.com>
Subject: Re: [PATCH] arm64: ftrace: stop using kstop_machine to enable/disable
 tracing


Thanks very much to Will and Steve for the wonderful comments, I will modify the
commit message, and remove the misleading comments about module text
disappearing case.

Thanks again,
Li Bin

on 2015/12/3 23:31, Steven Rostedt wrote:
> On Thu, 3 Dec 2015 15:09:26 +0000
> Will Deacon <will.deacon@....com> wrote:
>
>> Yeah, I think the comments on x86 and arm64 are out of date. They also
>> mention the freeing of __init sections -- is that still a concern?
> No we black list them, any section that we are not sure will be there
> when we expect it to has recordmcount.c nop out the calls to mcount and
> they are ignored. Remember the e1000e bug? This was the reproducer.
>
> Anyway, on my todo list is to allow init sections to be traced. To do
> so would mean that I need to add generic code that lets ftrace know to
> remove init sections at boot up. Right now (or at least the last time I
> checked, which was back in 2009), every arch had its own way of freeing
> init memory. If that has changed, or I can just place a hook where it
> happens (which is probably the easy part), I can allow init code to be
> traced too.
>
> -- Steve
>
>
> .
>


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