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Date: Thu, 1 Dec 2011 16:57:00 -0500
From: Christoph Hellwig <hch@infradead.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Greg KH <greg@kroah.com>, devel@driverdev.osuosl.org,
        lttng-dev@lists.lttng.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
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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
Message-ID: <20111201215700.GA16782@infradead.org>
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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
 b) especially don't export something as lowlevel as this one.