linux-kernel - Re: [PATCH 1/2] uprobes: Use a helper instead of ptrace's single step enable

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Date:	Tue, 31 Jul 2012 19:40:24 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, ananth@...ibm.com,
	a.p.zijlstra@...llo.nl, mingo@...hat.com,
	srikar@...ux.vnet.ibm.com, roland@...k.frob.com
Subject: Re: [PATCH 1/2] uprobes: Use a helper instead of ptrace's single
	step enable

On 07/31, Sebastian Andrzej Siewior wrote:
>
> +void __weak arch_uprobe_enable_step(struct task_struct *child,
> +		struct arch_uprobe *arch)
> +{
> +	user_enable_single_step(current);
> +}
> +
> +void __weak arch_uprobe_disable_step(struct task_struct *child,
> +		struct arch_uprobe *arch)
> +{
> +	user_disable_single_step(child);
> +}

I don't think this needs "struct task_struct *child", it is always
current "by definition". Only current can play with ->utask.

Oleg.

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