linux-kernel - Re: [RFC] [PATCH 2.6.37-rc5-tip 4/20] 4: uprobes: Adding and remove a uprobe in a rb tree.

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Date:	Tue, 25 Jan 2011 13:15:46 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rces.redhat.com>,
	Linux-mm <linux-mm@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 4/20]  4: uprobes: Adding and
 remove a uprobe in a rb tree.

On Thu, 2010-12-16 at 15:28 +0530, Srikar Dronamraju wrote:
> +/* Acquires uprobes_mutex */

Requires? afaict uprobes_mutex isn't actually used anywhere in this
patch.

Its use is added in the next patch.

> +static struct uprobe *uprobes_add(struct inode *inode,
> +                                       unsigned long offset)
> +{
> +       struct uprobe *uprobe, *cur_uprobe;
> +
> +       __iget(inode);
> +       uprobe = kzalloc(sizeof(struct uprobe), GFP_KERNEL);
> +
> +       if (!uprobe) {
> +               iput(inode);
> +               return NULL;
> +       }
> +       uprobe->inode = inode;
> +       uprobe->offset = offset;
> +
> +       /* add to uprobes_tree, sorted on inode:offset */
> +       cur_uprobe = insert_uprobe_rb_node(uprobe);
> +
> +       /* a uprobe exists for this inode:offset combination*/
> +       if (cur_uprobe) {
> +               kfree(uprobe);
> +               uprobe = cur_uprobe;
> +               iput(inode);
> +       } else
> +               init_rwsem(&uprobe->consumer_rwsem);
> +
> +       return uprobe;
> +} 
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