From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de ([212.227.17.24]:53403 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751693AbaIXSk5 (ORCPT ); Wed, 24 Sep 2014 14:40:57 -0400 From: Arnd Bergmann To: Catalin Marinas Cc: Robert Richter , Robert Richter , Bjorn Helgaas , Will Deacon , Liviu Dudau , Rob Herring , Sunil Goutham , "linux-arm-kernel@lists.infradead.org" , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 5/6] arm64, defconfig: Enable PCI Date: Wed, 24 Sep 2014 20:40:18 +0200 Message-ID: <3120493.DIoQFCi5Am@wuerfel> In-Reply-To: <20140924171047.GO15842@e104818-lin.cambridge.arm.com> References: <1411573068-12952-1-git-send-email-rric@kernel.org> <20140924162631.GI31556@rric.localhost> <20140924171047.GO15842@e104818-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: linux-pci-owner@vger.kernel.org List-ID: On Wednesday 24 September 2014 18:10:48 Catalin Marinas wrote: > On Wed, Sep 24, 2014 at 05:26:31PM +0100, Robert Richter wrote: > > On 24.09.14 18:14:11, Arnd Bergmann wrote: > > > On Wednesday 24 September 2014 17:37:47 Robert Richter wrote: > > > > config PCI > > > > bool "PCI support" > > > > + default y > > > > help > > > > This feature enables support for PCIe bus system. If you say Y > > > > here, the kernel will include drivers and infrastructure code > > > > to support PCIe bus devices. > > > > > > > > +config PCI_MSI > > > > + def_bool PCI > > > > + > > > > config PCI_DOMAINS > > > > def_bool PCI > > > > > > There is already a PCI_MSI symbol in drivers/pci/Kconfig. Just select that > > > from the PCI symbol above rather than defining a second one. > > > > The intention is not to have a second definition, instead this should > > enable the default value just for arm64. Thus I put it to > > arch/arm64/Kconfig. Otherwise it would be enabled per default on all > > archs. I don't think other architectures actually see the PCI symbol that is defined in the arm64 Kconfig file, but I might be wrong. > > We could have used select in config ARM64, but I tried to avoid using > > select due to the dependency issue and instead implement this with > > default-y/depends-on. Doing so it can be manually disabled too. How about adding a new symbol like config ARM64_PCI def_bool PCI select PCI_MSI > It may be better to simply set PCI and PCI_MSI as defaults in defconfig > rather than "default y" and an additional config PCI_MSI entry. Selecting PCI_MSI unconditionally seems fine to me. We won't have any ARM64 systems that only do classic PCI, and MSI is mandatory for PCIe. Arnd