linux-kernel - Re: [PATCH] uprobes: don't enable/disable signle step if the user did it

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Date:	Mon, 30 Jul 2012 17:15:35 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>
Subject: Re: [PATCH] uprobes: don't enable/disable signle step if the user
 did it

On 07/30/2012 04:16 PM, Oleg Nesterov wrote:

> I'd suggest you to make 2 patches:
>
> 	- 1/2 creates arch_uprobe_*_step(...) __weak helpers in
> 	      kernel/events/uprobes.c which simply call
> 	      user_*_single_step() and updates the callers
>
> 	      Not strictly necessary, but imho makes sense...
>
> 	- 2/2 adds the x86 implementation in arch/x86/kernel/uprobes.c
> 	      which still uses user_*_single_step() but checks
> 	      TIF_SINGLESTEP. As your patch does, but you should use
> 	      utask, not uprobe.
>
> IOW, I simply suggest to make your patch x86-specific. Then we
> will try to do more fixes/improvements.
>
>
> Sebastian, Ananth, what do you think?

Yup, let me try…

>
> Oleg.
>

Sebastian
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