linux-kernel - Re: [PATCH v6 1/4] pci: add pci_iomap

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Date:	Tue, 16 Jun 2015 12:16:38 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Dave Airlie <airlied@...ux.ie>,
	linux-fbdev <linux-fbdev@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Toshi Kani <toshi.kani@...com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juergen Gross <jgross@...e.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	venkatesh.pallipadi@...el.com,
	Stefan Bader <stefan.bader@...onical.com>,
	Ville Syrjälä <syrjala@....fi>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Borislav Petkov <bp@...e.de>, Davidlohr Bueso <dbueso@...e.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Jan Beulich <jbeulich@...e.com>,
	Roger Pau Monné <roger.pau@...rix.com>
Subject: Re: [PATCH v6 1/4] pci: add pci_iomap_wc() variants

On Thu, May 28, 2015 at 5:36 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> On Wed, May 27, 2015 at 1:04 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
>> On Tue, May 26, 2015 at 12:40:08PM -0500, Bjorn Helgaas wrote:
>>> On Fri, May 22, 2015 at 02:23:41AM +0200, Luis R. Rodriguez wrote:
>>> > On Thu, May 21, 2015 at 05:33:21PM -0500, Bjorn Helgaas wrote:
>>> > >
>>> > > I tentatively put this (and the rest of the series) on a pci/resource
>>> > > branch.  I'm hoping you'll propose some clarification about
>>> > > EXPORT_SYMBOL_GPL().
>>> >
>>> > EXPORT_SYMBOL_GPL() also serves to ensure only GPL modules can
>>> > only run that code. So for instance although we have "Dual BSD/GPL"
>>> > tags for modules pure "BSD" tags do not exist for module tags and
>>> > cannot run EXPORT_SYMBOL_GPL() code [0]. Also there is some folks
>>> > who do believe tha at run time all kernel modules are GPL [1] [2].
>>> > And to be precise even though the FSF may claim a list of licenses
>>> > are GPL-compatible we cannot rely on this list alone for our own
>>> > goals and if folks want to use our EXPORT_SYMBOL_GPL()s they must
>>> > discuss this on lkml [2].
>>>
>>> By "propose some clarification," I meant that I hoped you would propose a
>>> patch to Documentation/ that would give maintainers some guidance.
>>
>> I *really really* would hate to do so but only because you insist, I'll look
>> into this...
>
> OK done.

Bjorn,

This is now on Jonathan Corbet's tree and visible on linux-next:

https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=582ed8d51e2b6cb8a168c94852bca482685c2509

> Please let me know if there is anything else I can do to
> help.

Please let me know.

> Also as per review with Tomi, the framebuffer maintainer, he
> would prefer for only the required symbols to go through your tree.
> We'd then wait for the next merge window for them to perculate to
> Linus' tree and once there I'd send him a pull request for the
> framebuffer device driver changes alone. So this does mean we'll have
> no users of the symbols for a full release, but again, this is as per
> Tomi's preference. This strategy is also the preference then for the
> pci_iomap_wc() series as well. With that in mind, perhaps the lib
> patch can go in as we'd have no users but we do have a few future
> possible expected users.

I repoked Tomi about this topic with a new context provided, my
expressed hope was to just merge the fbvdev dependent changes for both
series (now both Acked by Tomi) through your tree.

 Luis
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