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 16:29:59 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.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.

On 06/14, Srikar Dronamraju wrote:
>
> * Oleg Nesterov <oleg@...hat.com> [2011-06-13 21:57:01]:
>
> > > +	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?

Yes, modulo s/PAGE_SIZE/PAGE_SHIFT. But please double check, I can be
easily wrong ;)

Oleg.

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