linux-kernel - Re: [PATCH V6 01/18] x86: Make page cache mode a real type

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Date:	Thu, 22 Jan 2015 12:11:51 +0100
From:	Juergen Gross <jgross@...e.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Steven Noonan <steven@...inklabs.net>,
	"H. Peter Anvin" <hpa@...or.com>, Linux-X86 <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, stefan.bader@...onical.com,
	Linux Kernel mailing List <linux-kernel@...r.kernel.org>,
	xen-devel@...ts.xensource.com,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	ville.syrjala@...ux.intel.com,
	David Vrabel <david.vrabel@...rix.com>,
	Jan Beulich <jbeulich@...e.com>, toshi.kani@...com,
	plagnioj@...osoft.com, tomi.valkeinen@...com, bhelgaas@...gle.com
Subject: Re: [PATCH V6 01/18] x86: Make page cache mode a real type

On 01/22/2015 12:06 PM, Thomas Gleixner wrote:
> On Thu, 22 Jan 2015, Juergen Gross wrote:
>> On 01/22/2015 08:11 AM, Steven Noonan wrote:
>>> I notice these two symbols are exported GPL-only. This breaks builds
>>> of several out-of-tree non-GPL modules such as the NVIDIA driver, and
>>> VMware modules, etc. What is the appropriate code path for proprietary
>>> modules to use when setting page cache mode flags? Alternatively, is
>>> it possible for these EXPORT_SYMBOL_GPLs to be changed to
>>> EXPORT_SYMBOL?
>>
>> I don't mind you sending a patch to change this. I won't object such a
>> patch. OTOH this is more kind of a political question and I don't want
>> to spend my time on arguing.
>
> It's rather simple. If the new cache stuff replaces code which was
> available under EXPORT_SYMBOL, we either need a compat export or make
> the new exports non GPL.
>
> Not that I like it, but that has been the policy so far. We only break
> out of tree stuff if the export is broken or security relevant, like
> we did with the init_mm export a few years ago.

Okay, in this case I'll write patch.

Thanks for clarifying this.


Juergen

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