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Date: Thu, 9 Jun 2011 11:17:54 +0530
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Subject: Re: [PATCH v4 3.0-rc2-tip 13/22] 13: uprobes: Handing int3 and
 singlestep exception.
Message-ID: <20110609054754.GD6123@linux.vnet.ibm.com>
Reply-To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
References: <20110607125804.28590.92092.sendpatchset@localhost6.localdomain6>
 <20110607130051.28590.68088.sendpatchset@localhost6.localdomain6>
 <20110608221141.GB9965@wicker.gateway.2wire.net>
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To: Stephen Wilson <wilsons@start.ca>
Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Andi Kleen <andi@firstfloor.org>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Jonathan Corbet <corbet@lwn.net>, Thomas Gleixner <tglx@linutronix.de>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, LKML <linux-kernel@vger.kernel.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Andrew Morton <akpm@linux-foundation.org>

> > + */
> > +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?
> 

Yes, the two lines where we check for !uprobe and return are redundant
and can be removed. Will be corrected in the next patchset.

-- 
Thanks and Regards
Srikar

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