linux-kernel - Re: [PATCH 2/4] uprobes/powerpc: Do not use arch_uprobe_*

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Message-ID: <20121029053340.GB3400@in.ibm.com>
Date:	Mon, 29 Oct 2012 11:03:40 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Rabin Vincent <rabin@....in>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] uprobes/powerpc: Do not use arch_uprobe_*_step()
	helpers

On Sun, Oct 28, 2012 at 06:39:28PM +0100, Oleg Nesterov wrote:
> No functional changes.
> 
> powerpc is the only user of arch_uprobe_enable/disable_step() helpers,
> but they should die. They can not be used correctly, every arch needs
> its own implementation (like x86 does). And they do not really help
> even as initial-and-almost-working code, arch_uprobe_*_xol() hooks can
> easily use user_enable/disable_single_step() directly.
> 
> Change arch_uprobe_*_step() to do nothing, and convert powerpc to use
> ptrace helpers. This is equally wrong, powerpc needs the arch-specific
> fixes.

Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

I will send a powerpc patch to directly use the MSR bits for stepping.

Ananth

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