linux-kernel - Re: Fwd: uprobes: register/unregister probes.

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Message-ID: <20111124070303.GB28065@linux.vnet.ibm.com>
Date:	Thu, 24 Nov 2011 12:33:03 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	tulasidhard@...il.com
Subject: Re: Fwd: uprobes: register/unregister probes.

> On Fri, 2011-11-18 at 16:37 +0530, Srikar Dronamraju wrote:
> > +int register_uprobe(struct inode *inode, loff_t offset,
> > +                               struct uprobe_consumer *consumer)
> > +{
> > +       struct uprobe *uprobe;
> > +       int ret = -EINVAL;
> > +
> > +       if (!consumer || consumer->next)
> > +               return ret;
> > +
> > +       inode = igrab(inode);
> 
> So why are you dealing with !consumer but not with !inode? and why
> does
> it make sense to allow !consumer at all?
> 


I am not sure if I got your comment correctly.

I do check for inode just after the igrab.

I am actually not dealing with !consumer.
If the consumer is NULL, then we dont have any handler to run so why
would we want to register such a probe?

Also if consumer->next is Non-NULL, that means that this consumer was
already used.  Reusing the consumer, can result in consumers list getting
broken into two.

If you meant something else please clarify.

-- 
Thanks and Regards
Srikar

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