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To:     LKML <linux-kernel@vger.kernel.org>, linux-hyperv@vger.kernel.org
Cc:     Matthew Wilcox <willy@infradead.org>,
        Jake Oshins <jakeo@microsoft.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Sasha Levin <sashal@kernel.org>,
        linux-pci <linux-pci@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Subject: [PATCH] PCI: hv: fix pci-hyperv build, depends on SYSFS
Message-ID: <69c25bc3-da00-2758-92ee-13c82b51fc45@infradead.org>
Date:   Tue, 2 Jul 2019 16:24:30 -0700
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From: Randy Dunlap <rdunlap@infradead.org>

Fix build errors when building almost-allmodconfig but with SYSFS
not set (not enabled).  Fixes these build errors:

ERROR: "pci_destroy_slot" [drivers/pci/controller/pci-hyperv.ko] undefined!
ERROR: "pci_create_slot" [drivers/pci/controller/pci-hyperv.ko] undefined!

drivers/pci/slot.o is only built when SYSFS is enabled, so
pci-hyperv.o has an implicit dependency on SYSFS.
Make that explicit.

Also, depending on X86 && X86_64 is not needed, so just change that
to depend on X86_64.

Fixes: 4daace0d8ce8 ("PCI: hv: Add paravirtual PCI front-end for Microsoft Hyper-V VMs")

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Jake Oshins <jakeo@microsoft.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Sasha Levin <sashal@kernel.org>
Cc: linux-hyperv@vger.kernel.org
---
 drivers/pci/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- lnx-52-rc7.orig/drivers/pci/Kconfig
+++ lnx-52-rc7/drivers/pci/Kconfig
@@ -181,7 +181,7 @@ config PCI_LABEL
 
 config PCI_HYPERV
         tristate "Hyper-V PCI Frontend"
-        depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
+        depends on X86_64 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && SYSFS
         help
           The PCI device frontend driver allows the kernel to import arbitrary
           PCI devices from a PCI backend to support PCI driver domains.