linux-kernel - Re: linux-next: manual merge of the xen-two tree with Linus' tree

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Date:	Tue, 02 Oct 2012 12:37:16 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Stephen Rothwell" <sfr@...b.auug.org.au>,
	"Stefano Stabellini" <stefano.stabellini@...citrix.com>
Cc:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>
Subject: Re: linux-next: manual merge of the xen-two tree with Linus'
 tree

>>> On 02.10.12 at 12:44, Stefano Stabellini <stefano.stabellini@...citrix.com> wrote:
>> --- a/drivers/xen/Makefile
>> +++ b/drivers/xen/Makefile
>> @@@ -4,8 -8,11 +8,12 @@@ obj-y	+= xenbus
>>   nostackp := $(call cc-option, -fno-stack-protector)
>>   CFLAGS_features.o			:= $(nostackp)
>>   
>> + obj-$(CONFIG_XEN_DOM0)			+= $(dom0-y)
>> + dom0-$(CONFIG_PCI) += pci.o
>> ++dom0-$(CONFIG_X86) += dbgp.o
>> + dom0-$(CONFIG_ACPI) += acpi.o
>> + dom0-$(CONFIG_X86) += pcpu.o
>>   obj-$(CONFIG_BLOCK)			+= biomerge.o
>> - obj-$(CONFIG_HOTPLUG_CPU)		+= cpu_hotplug.o
>>   obj-$(CONFIG_XEN_XENCOMM)		+= xencomm.o
>>   obj-$(CONFIG_XEN_BALLOON)		+= xen-balloon.o
>>   obj-$(CONFIG_XEN_SELFBALLOONING)	+= xen-selfballoon.o
>  
> 
> Considering that dbgp doesn't seem to be very useful without PCI at the
> moment, could we just turn it into:
> 
> dom0-$(CONFIG_PCI) += dbgp.o
> 
> ?

Better not - the code is specifically not PCI-only. And I can't see
how it would be harmful to be compiled on e.g. ARM (so the
merge perhaps really should use XEN_DOM0 alone, without
X86. If anything (and that may indeed be a minor oversight of
the original patch) one might want it to depend on USB_SUPPORT,
as without that no in-tree debug port capable driver would be
able to load (and hence interfere with Xen's use of the debug
port). However, as long as it builds fine with USB_SUPPORT
undefined (which I believe it does), having it in the shape it
is allows for out-of-tree drivers as well (as long as they make
use of the designated interface).

Jan

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