linux-kernel - Re: [RFC] [PATCH 2.6.37-rc5-tip 8/20] 8: uprobes: mmap and fork hooks.

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Message-ID: <20110128045353.GU19725@linux.vnet.ibm.com>
Date:	Fri, 28 Jan 2011 10:23:53 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 8/20]  8: uprobes: mmap and fork
 hooks.

* Steven Rostedt <rostedt@...dmis.org> [2011-01-27 12:03:57]:

> On Wed, 2011-01-26 at 14:36 +0530, Srikar Dronamraju wrote:
> 
> > > Not to mention that p is uninitialized. Did this code ever work?
> > 
> > I think the original patch that I sent had p initialized. I think it got
> > dropped off by Peter when he replied. Please do confirm.
> 
> 
> > +static void search_within_subtree(struct rb_node *n, struct inode *inode,
> > +               struct list_head *tmp_list)
> > +{
> > +       struct rb_node *p;
> > +
> > +       if (p)
> > +               __search_within_subtree(p, inode, tmp_list);
> > +
> > +       p = n->rb_right;
> > +       if (p)
> > +               __search_within_subtree(p, inode, tmp_list);
> > +}
> > +
> > 
> The above is from the original patch. 'p' does not look initialized to
> me.
> 

> -- Steve
> 
> 

Here is the extract from the original patch at
https://lkml.org/lkml/2010/12/16/74 that I sent to LKML and I dont see
p being uninitialized. 

+
+static void search_within_subtree(struct rb_node *n, struct inode *inode,
+		struct list_head *tmp_list)
+{
+	struct rb_node *p;
+
+	p = n->rb_left;
+	if (p)
+		__search_within_subtree(p, inode, tmp_list);
+
+	p = n->rb_right;
+	if (p)
+		__search_within_subtree(p, inode, tmp_list);
+}
+

However I have already agreed to remove this recursion and replace it
with a rb_next() logic.

-- 
Thanks and Regards
Srikar
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