linux-kernel - Re: [PATCH v4 3.0-rc2-tip 13/22] 13: uprobes: Handing int3 and singlestep exception.

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Date:	Wed, 8 Jun 2011 18:11:41 -0400
From:	Stephen Wilson <wilsons@...rt.ca>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 13/22] 13: uprobes: Handing int3 and
 singlestep exception.



On Tue, Jun 07, 2011 at 06:30:51PM +0530, Srikar Dronamraju wrote:
> +/*
> + * uprobe_post_notifier gets called in interrupt context.
> + * It completes the single step operation.
> + */
> +int uprobe_post_notifier(struct pt_regs *regs)
> +{
> +	struct uprobe *uprobe;
> +	struct uprobe_task *utask;
> +
> +	if (!current->mm || !current->utask || !current->utask->active_uprobe)
> +		/* task is currently not uprobed */
> +		return 0;
> +
> +	utask = current->utask;
> +	uprobe = utask->active_uprobe;
> +	if (!uprobe)
> +		return 0;
> +
> +	set_thread_flag(TIF_UPROBE);
> +	return 1;
> +}

Looks like this can be simplified.  If current->utask->active_uprobe is
non-null then surely the assignment to uprobe will be too?


-- 
steve

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