linux-kernel - Re: [PATCH] PCI: hv: Fix build error without CONFIG

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Message-ID: <20190614152336.GA26846@e121166-lin.cambridge.arm.com>
Date:   Fri, 14 Jun 2019 16:23:36 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Yuehaibing <yuehaibing@...wei.com>
Cc:     bhelgaas@...gle.com, sthemmin@...rosoft.com, sashal@...nel.org,
        decui@...rosoft.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: hv: Fix build error without CONFIG_SYSFS

On Fri, Jun 14, 2019 at 10:19:10PM +0800, Yuehaibing wrote:
> Hi all,
> 
> Friendly ping...

We should address Michael's question:

https://lore.kernel.org/linux-pci/BYAPR21MB12211EEA95200F437C8E37ECD71A0@BYAPR21MB1221.namprd21.prod.outlook.com/

Lorenzo

> On 2019/5/31 23:09, YueHaibing wrote:
> > 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@...wei.com>
> > Fixes: a15f2c08c708 ("PCI: hv: support reporting serial number as slot information")
> > Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > ---
> >  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.
> > 
>