linux-kernel - Re: [PATCH v6 3/6] arm64: Kprobes with single stepping support

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Message-ID: <555F5FE3.8060702@linaro.org>
Date:	Fri, 22 May 2015 12:57:07 -0400
From:	David Long <dave.long@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>,
	William Cohen <wcohen@...hat.com>
CC:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Steve Capper <steve.capper@...aro.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	sandeepa.s.prabhu@...il.com, Russell King <linux@....linux.org.uk>,
	davem@...emloft.net, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 3/6] arm64: Kprobes with single stepping support

On 05/22/15 12:54, Catalin Marinas wrote:
> On Fri, May 22, 2015 at 11:49:37AM -0400, William Cohen wrote:
>> On 05/22/2015 07:00 AM, Catalin Marinas wrote:
>>> Any plans to post an updated version with the "unexpected single-step
>>> error" fixed?
>>
>> The only place this issue with the "unexpected single-step error" has
>> been observed is with the arm64 kretporbe handler code calling kprobed
>> functions.  Experiments with kprobed functions being called in the
>> kprobe handlers showed that situation was handled appropriately.
>>
>> There is proposed fix to address the issue with the trampoline, the
>> attached patch.  This is modeled after the way that the x86 handles
>> the kretprobe.  The trampoline directly save and restores the
>> registers and uses a normal call to the kretprobe handler.  It
>> operates similarly to what you are suggesting above, but just for the
>> special case of the kretprobes.
>
> Thanks. I guess David will post a v7 series with this patch included and
> other comments addressed.
>
> BTW, I'll be on holiday for a week, back on the 1st of June. Hopefully
> this series gets some more reviews by then ;)
>

Yes, the v7 patch is in the works, with Will Cohen's trampoline fixes as 
well as your feedback.

-fl



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