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Message-ID: <alpine.DEB.2.02.1503231838440.7982@kaball.uk.xensource.com> Date: Mon, 23 Mar 2015 18:39:47 +0000 From: Stefano Stabellini <stefano.stabellini@...citrix.com> To: Hanjun Guo <guohanjun@...wei.com> CC: "Rafael J. Wysocki" <rjw@...ysocki.net>, Julien Grall <julien.grall@...aro.org>, Naresh Bhat <naresh.bhat@...aro.org>, Hanjun Guo <hanjun.guo@...aro.org>, Jon Fraser <jfraser@...adcom.com>, Parth Dixit <parth.dixit@...aro.org>, Stefano Stabellini <stefano.stabellini@...citrix.com>, Catalin Marinas <Catalin.Marinas@....com>, Olof Johansson <olof@...om.net>, "grant.likely@...aro.org" <grant.likely@...aro.org>, Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>, Arnd Bergmann <arnd@...db.de>, Mark Rutland <Mark.Rutland@....com>, "graeme.gregory@...aro.org" <graeme.gregory@...aro.org>, Sudeep Holla <Sudeep.Holla@....com>, "jcm@...hat.com" <jcm@...hat.com>, Marc Zyngier <Marc.Zyngier@....com>, "Mark Brown" <broonie@...nel.org>, Robert Richter <rric@...nel.org>, Timur Tabi <timur@...eaurora.org>, Ashwin Chaugule <ashwinc@...eaurora.org>, "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>, "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernelorg" <linux-kernel@...r.kernel.org>, "linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>, Ian Campbell <Ian.Campbell@...rix.com> Subject: Re: [PATCH v10 00/21] Introduce ACPI for ARM64 based on ACPI 5.1 On Mon, 23 Mar 2015, Hanjun Guo wrote: > On 2015/3/23 6:11, Rafael J. Wysocki wrote: > > On Sunday, March 22, 2015 09:32:48 PM Julien Grall wrote: > >> On 22/03/2015 21:49, Rafael J. Wysocki wrote: > >>> On Sunday, March 22, 2015 09:05:21 PM Julien Grall wrote: > >>>> Hello, > >>>> > >>>> On 21/03/2015 12:09, Naresh Bhat wrote: > >>>>> From 268dcdafa34a690e2f99c0784ca33a6d2352ecf5 Mon Sep 17 00:00:00 2001 > >>>>> From: Hanjun Guo <hanjun.guo@...aro.org <mailto:hanjun.guo@...aro.org>> > >>>>> Date: Sat, 21 Mar 2015 14:43:54 +0800 > >>>>> Subject: [PATCH] XEN / ACPI: Make XEN ACPI depend on X86 > >>>>> > >>>>> When ACPI is enabled on ARM64, XEN ACPI will also compiled > >>>>> into the kernel, but XEN ACPI is x86 dependent, so introduce > >>>>> CONFIG_XEN_ACPI to make it depend on x86 before XEN ACPI is > >>>>> functional on ARM64. > >>>>> > >>>>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org > >>>>> <mailto:hanjun.guo@...aro.org>> > >>>>> --- > >>>>> drivers/xen/Kconfig | 4 ++++ > >>>>> drivers/xen/Makefile | 2 +- > >>>>> 2 files changed, 5 insertions(+), 1 deletion(-) > >>>>> > >>>>> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig > >>>>> index b812462..a31cd29 100644 > >>>>> --- a/drivers/xen/Kconfig > >>>>> +++ b/drivers/xen/Kconfig > >>>>> @@ -253,4 +253,8 @@ config XEN_EFI > >>>>> def_bool y > >>>>> depends on X86_64 && EFI > >>>>> > >>>>> +config XEN_ACPI > >>>>> + def_bool y > >>>>> + depends on X86 && ACPI > >>>>> + > >>>>> endmenu > >>>>> diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile > >>>>> index 2ccd359..f4622ab 100644 > >>>>> --- a/drivers/xen/Makefile > >>>>> +++ b/drivers/xen/Makefile > >>>>> @@ -13,7 +13,7 @@ CFLAGS_efi.o += -fshort-wchar > >>>>> > >>>>> dom0-$(CONFIG_PCI) += pci.o > >>>>> dom0-$(CONFIG_USB_SUPPORT) += dbgp.o > >>>>> -dom0-$(CONFIG_ACPI) += acpi.o $(xen-pad-y) > >>>>> +dom0-$(CONFIG_XEN_ACPI) += acpi.o $(xen-pad-y) > >>>>> xen-pad-$(CONFIG_X86) += xen-acpi-pad.o > >>>>> dom0-$(CONFIG_X86) += pcpu.o > >>>>> obj-$(CONFIG_XEN_DOM0) += $(dom0-y) > >>>> [..] > >>>> > >>>>> AFAIK, There is already a kernel patch exists to fix this issue. I > >>>>> think Julien or Parth is a right person to ask. Hence I am CCed Julien > >>>>> Grall too. > >>>> The ACPI support for Xen is not ready. So I think avoiding to compile > >>>> drivers/xen/acpi.c on ARM64/ARM seems the better solution for now. > >>>> > >>>> Although, rather than introducing a new CONFIG option, I would use the > >>>> same trick we use within the Makefile to avoid hotplug.c on ARM/ARM64. > >>>> > >>>> ifeq ($(filter y, $(CONFIG_ARM) $(CONFIG_ARM64)), ) > >>>> dom0-$(CONFIG_ACPI) += acpi.o $(xen-pad-y) > >>>> endif > >>> Well, is avoiding an extra CONFIG_ option worth the ugliness of this? > >> When the support of ACPI for Xen will come, the CONFIG_ option will be > >> an alias to CONFIG_XEN. > >> > >> In this case the CONFIG_ option won't bring much improvement to the code > >> and add an extra indirection. > >> > >> The "ugliness" option has, at least, the advantage to be tiny and > >> self-contained. > > Oh well, not really. You're moving a config-time check to compile time > > which means that it will be done every time this Makefile is executed > > and for all architectures that execute it. Not nice. > > > > Also I think that ia64 is missing from the list, but I may be wrong. > > In commit d52eefb47d (ia64/xen: Remove Xen support for ia64), XEN is > not supported anymore on ia64 now. > > > > > Not to mention the fact that the dependency will be rather difficult to find > > for tools like xconfig ... > > I also think introducing a CONFIG_ option is a better idea. Me too -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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