linux-kernel - Re: [PATCH] PCI: hv: fix pci-hyperv build, depends on SYSFS

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Message-ID: <20190703001541.GG1729@bombadil.infradead.org>
Date:   Tue, 2 Jul 2019 17:15:41 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-hyperv@...r.kernel.org,
        Jake Oshins <jakeo@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI: hv: fix pci-hyperv build, depends on SYSFS

On Tue, Jul 02, 2019 at 04:24:30PM -0700, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@...radead.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.

I wonder if we shouldn't rather provide no-op versions of
pci_create|destroy_slot for when SYSFS is not set?