linux-kernel - Re: [PATCH v4 3.0-rc2-tip 4/22] 4: Uprobes: register/unregister probes.

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Date:	Tue, 14 Jun 2011 17:30:23 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.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>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 4/22]  4: Uprobes: register/unregister
 probes.

* Oleg Nesterov <oleg@...hat.com> [2011-06-13 21:57:01]:

> On 06/07, Srikar Dronamraju wrote:
> >
> > +int register_uprobe(struct inode *inode, loff_t offset,
> > +				struct uprobe_consumer *consumer)
> > +{
> > +	struct prio_tree_iter iter;
> > +	struct list_head try_list, success_list;
> > +	struct address_space *mapping;
> > +	struct mm_struct *mm, *tmpmm;
> > +	struct vm_area_struct *vma;
> > +	struct uprobe *uprobe;
> > +	int ret = -1;
> > +
> > +	if (!inode || !consumer || consumer->next)
> > +		return -EINVAL;
> > +
> > +	if (offset > inode->i_size)
> > +		return -EINVAL;
> > +
> > +	uprobe = alloc_uprobe(inode, offset);
> > +	if (!uprobe)
> > +		return -ENOMEM;
> > +
> > +	INIT_LIST_HEAD(&try_list);
> > +	INIT_LIST_HEAD(&success_list);
> > +	mapping = inode->i_mapping;
> > +
> > +	mutex_lock(&uprobes_mutex);
> > +	if (uprobe->consumers) {
> > +		ret = 0;
> > +		goto consumers_add;
> > +	}
> > +
> > +	mutex_lock(&mapping->i_mmap_mutex);
> > +	vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, 0, 0) {
> 
> I didn't actually read this patch yet, but this looks suspicious.
> Why begin == end == 0? Doesn't this mean we are ignoring the mappings
> with vm_pgoff != 0 ?
> 
> Perhaps this should be offset >> PAGE_SIZE?
> 

Okay, 
I guess you meant something like this.

	vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {

where pgoff == offset >> PAGE_SIZE
Right?

-- 
Thanks and Regards
Srikar
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