linux-kernel - Re: [PATCH 01/11] mm: export vmalloc_sync

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Message-ID: <20111201222803.GA10853@infradead.org>
Date:	Thu, 1 Dec 2011 17:28:03 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Greg KH <greg@...ah.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	devel@...verdev.osuosl.org, lttng-dev@...ts.lttng.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, David Howells <dhowells@...hat.com>,
	David McCullough <davidm@...pgear.com>,
	D Jeff Dionne <jeff@...inux.org>,
	Greg Ungerer <gerg@...pgear.com>,
	Paul Mundt <lethal@...ux-sh.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] mm: export vmalloc_sync_all symbol to GPL modules

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.

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