[PATCH] PCI: hv: Fix build error without CONFIG_SYSFS

[YueHaibing]

while building without CONFIG_SYSFS, fails as below:

drivers/pci/controller/pci-hyperv.o: In function 'hv_pci_assign_slots':
pci-hyperv.c:(.text+0x40a): undefined reference to 'pci_create_slot'
drivers/pci/controller/pci-hyperv.o: In function 'pci_devices_present_work':
pci-hyperv.c:(.text+0xc02): undefined reference to 'pci_destroy_slot'
drivers/pci/controller/pci-hyperv.o: In function 'hv_pci_remove':
pci-hyperv.c:(.text+0xe50): undefined reference to 'pci_destroy_slot'
drivers/pci/controller/pci-hyperv.o: In function 'hv_eject_device_work':
pci-hyperv.c:(.text+0x11f9): undefined reference to 'pci_destroy_slot'

Select SYSFS while PCI_HYPERV is set to fix this.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot information")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/pci/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 2ab9240..6722952 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -182,6 +182,7 @@ config PCI_LABEL
 config PCI_HYPERV
         tristate "Hyper-V PCI Frontend"
         depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
+	select SYSFS
         help
           The PCI device frontend driver allows the kernel to import arbitrary
           PCI devices from a PCI backend to support PCI driver domains.
-- 
2.7.4