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Date: Thu, 1 Dec 2011 14:13:37 -0800
From: Greg KH <greg@kroah.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        devel@driverdev.osuosl.org, lttng-dev@lists.lttng.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
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        D Jeff Dionne <jeff@uClinux.org>, Greg Ungerer <gerg@snapgear.com>,
        Paul Mundt <lethal@linux-sh.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/11] mm: export vmalloc_sync_all symbol to GPL modules
Message-ID: <20111201221337.GB3365@kroah.com>
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On Thu, Dec 01, 2011 at 04:57:00PM -0500, Christoph Hellwig wrote:
> On Thu, Dec 01, 2011 at 04:41:13PM -0500, Mathieu Desnoyers wrote:
> > LTTng needs this symbol exported. It calls it to ensure its tracing
> > buffers and allocated data structures never trigger a page fault. This
> > is required to handle page fault handler tracing and NMI tracing
> > gracefully.
> 
> We:
> 
>  a) don't export symbols unless they have an intree-user

lttng is now in-tree in the drivers/staging/ area.  See linux-next for
details if you are curious.

>  b) especially don't export something as lowlevel as this one.

Mathieu, there's nothing else you can do to get this information?  Or
does lttng really want such lowlevel data?

thanks,

greg k-h