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Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 14/20] 14: uprobes: Handing int3
 and singlestep exception.
From: Peter Zijlstra <peterz@infradead.org>
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Date: Wed, 26 Jan 2011 16:29:48 +0100
Message-ID: <1296055788.28776.1222.camel@laptop>
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Sender: owner-linux-mm@kvack.org
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Christoph Hellwig <hch@infradead.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Oleg Nesterov <oleg@redhat.com>, LKML <linux-kernel@vger.kernel.org>, SystemTap <systemtap@sources.redhat.com>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Frederic Weisbecker <fweisbec@gmail.com>, Andi Kleen <andi@firstfloor.org>, Andrew Morton <akpm@linux-foundation.org>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
List-ID: <linux-mm.kvack.org>

On Wed, 2011-01-26 at 20:44 +0530, Srikar Dronamraju wrote:
> So it simplifies to=20
>=20
>         down_read(&mm->mmap_sem);
>         vma =3D find_vma(mm, probept);
>         if (valid_vma(vma)) {
>                u =3D find_uprobe(vma->vm_file->f_mapping->host,
>                                probept - vma->vm_start);
>         }
>         up_read(&mm->mmap_sem);=20

Almost, the offset within a file is something like:

  (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT)


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