linux-kernel - Re: [patch] x86, xen: fix build dependency when USB

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Date:	Fri, 02 Nov 2012 08:19:07 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	<rientjes@...gle.com>, <jeremy@...p.org>, <x86@...nel.org>,
	<tglx@...utronix.de>, <torvalds@...ux-foundation.org>,
	<xen-devel@...ts.xensource.com>, <mingo@...hat.com>,
	<linux-kernel@...r.kernel.org>, <hpa@...or.com>
Subject: Re: [patch] x86, xen: fix build dependency when USB_SUPPORT is
 not enabled

>>> On 01.11.12 at 23:05, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> On Thu, Nov 01, 2012 at 08:04:58PM +0000, Jan Beulich wrote:
>> >>> Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> 11/01/12 1:49 PM >>>
>> >On Wed, Oct 31, 2012 at 10:42:30PM -0700, David Rientjes wrote:
>> >> CONFIG_XEN_DOM0 must depend on CONFIG_USB_SUPPORT, otherwise there is no 
>> >> definition of xen_dbgp_reset_prep() and xen_dbgp_external_startup() 
>> >> resulting in the following link error:
>> >> 
>> >> drivers/built-in.o: In function `dbgp_reset_prep':
>> >> (.text+0x1e03c5): undefined reference to `xen_dbgp_reset_prep'
>> >> drivers/built-in.o: In function `dbgp_external_startup':
>> >> (.text+0x1e0d55): undefined reference to `xen_dbgp_external_startup'
>> >
>> >There is another patch that needs to be Acked and picked up by
>> >Greg KH that fixes this.
>> >
>> >Let me poke Jan Beulich to repost it with the appropiate Acks.
>> 
>> It's been picked up already, but another dependency problem was found with
>> it (due to not having used CONFIG_USB_SUPPORT as dependency, as I had
>> first submitted).
> 
> Oh. I missed that part - so do you think that this patch should also
> be used? Or do you think there is another way to fix this?
> 
> I am in transit right now so I can't prep a patch (and the laptop I've
> is extremely slow to even do a test compile).

Alan and I settled on relaxing the condition in ehci-dbgp.c to
IS_ENABLED(USB). But it's not clear to me if I should send an
incremental patch or a replacement one (neither he nor Greg
answered my respective inquiry).

Jan

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