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SubjectRE: [PATCH v2] PCI: hv: fix pci-hyperv build when SYSFS not enabled
Date


> -----Original Message-----
> From: Randy Dunlap <rdunlap@infradead.org>
> Sent: Wednesday, July 3, 2019 12:59 PM
> To: LKML <linux-kernel@vger.kernel.org>; linux-pci <linux-
> pci@vger.kernel.org>
> Cc: Matthew Wilcox <willy@infradead.org>; Jake Oshins
> <jakeo@microsoft.com>; KY Srinivasan <kys@microsoft.com>; Haiyang
> Zhang <haiyangz@microsoft.com>; Stephen Hemminger
> <sthemmin@microsoft.com>; Sasha Levin <sashal@kernel.org>; Bjorn
> Helgaas <bhelgaas@google.com>; linux-hyperv@vger.kernel.org; Dexuan
> Cui <decui@microsoft.com>; Yuehaibing <yuehaibing@huawei.com>
> Subject: [PATCH v2] PCI: hv: fix pci-hyperv build when SYSFS not enabled
>
> From: Randy Dunlap <rdunlap@infradead.org>
>
> Fix build of drivers/pci/controller/pci-hyperv.o when
> CONFIG_SYSFS is not set/enabled by adding stubs for
> pci_create_slot() and pci_destroy_slot().
>
> 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!
>
> Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot
> information")
>
> 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: Bjorn Helgaas <bhelgaas@google.com>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-hyperv@vger.kernel.org
> Cc: Dexuan Cui <decui@microsoft.com>
> Cc: Yuehaibing <yuehaibing@huawei.com>
> ---
> v2:
> - provide non-CONFIG_SYSFS stubs for pci_create_slot() and
> pci_destroy_slot() [suggested by Matthew Wilcox <willy@infradead.org>]
> - use the correct Fixes: tag [Dexuan Cui <decui@microsoft.com>]
>
> include/linux/pci.h | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> --- lnx-52-rc7.orig/include/linux/pci.h
> +++ lnx-52-rc7/include/linux/pci.h
> @@ -25,6 +25,7 @@
> #include <linux/ioport.h>
> #include <linux/list.h>
> #include <linux/compiler.h>
> +#include <linux/err.h>
> #include <linux/errno.h>
> #include <linux/kobject.h>
> #include <linux/atomic.h>
> @@ -947,14 +948,21 @@ int pci_scan_root_bus_bridge(struct pci_
> struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev
> *dev,
> int busnr);
> void pcie_update_link_speed(struct pci_bus *bus, u16 link_status);
> +#ifdef CONFIG_SYSFS
> +void pci_dev_assign_slot(struct pci_dev *dev);
> struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
> const char *name,
> struct hotplug_slot *hotplug);
> void pci_destroy_slot(struct pci_slot *slot);
> -#ifdef CONFIG_SYSFS
> -void pci_dev_assign_slot(struct pci_dev *dev);
> #else
> static inline void pci_dev_assign_slot(struct pci_dev *dev) { }
> +static inline struct pci_slot *pci_create_slot(struct pci_bus *parent,
> + int slot_nr,
> + const char *name,
> + struct hotplug_slot *hotplug) {
> + return ERR_PTR(-EINVAL);
> +}
> +static inline void pci_destroy_slot(struct pci_slot *slot) { }
> #endif
> int pci_scan_slot(struct pci_bus *bus, int devfn);
> struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn);
>

The serial number in slot info is used to match VF NIC with Synthetic NIC.
Without selecting SYSFS, the SRIOV feature will fail on VM on Hyper-V and
Azure. The first version of this patch should be used.

@Stephen Hemminger how do you think?

Thanks,
- Haiyang
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