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Date: Thu, 1 Dec 2011 17:28:03 -0500
From: Christoph Hellwig <hch@infradead.org>
To: Greg KH <greg@kroah.com>
Cc: Christoph Hellwig <hch@infradead.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
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        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
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On Thu, Dec 01, 2011 at 02:13:37PM -0800, Greg KH wrote:
> 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.

Eww - merging stuff without discussion on lkml is more than evil.

Either way, it was guaranteed that drivers/staging is considered out of
tree for core code.  I'm defintively dead set against exporting anything
for staging and opening that slippery slope.