linux-kernel - RE: [patch 3/3] x86/vector/msi: Select CONFIG_GENERIC_IRQ_RESERVATION

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Date:   Tue, 17 Oct 2017 23:49:30 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dexuan Cui <decui@...rosoft.com>
cc:     LKML <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marc Zyngier <marc.zyngier@....com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        Josh Poulson <jopoulso@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Simon Xiao <sixiao@...rosoft.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "Mihai Costache (Cloudbase Solutions SRL)" <v-micos@...rosoft.com>,
        Jork Loeser <Jork.Loeser@...rosoft.com>
Subject: RE: [patch 3/3] x86/vector/msi: Select
 CONFIG_GENERIC_IRQ_RESERVATION_MODE

On Tue, 17 Oct 2017, Dexuan Cui wrote:

> > From: Thomas Gleixner [mailto:tglx@...utronix.de]
> > Sent: Tuesday, October 17, 2017 12:55 AM
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -95,7 +95,7 @@ config X86
> >  	select GENERIC_IRQ_MATRIX_ALLOCATOR	if X86_LOCAL_APIC
> >  	select GENERIC_IRQ_MIGRATION		if SMP
> >  	select GENERIC_IRQ_PROBE
> > -	select GENERIC_IRQ_SHOW
> > +	select GENERIC_IRQ_RESERVATION_MODE
> >  	select GENERIC_PENDING_IRQ		if SMP
> >  	select GENERIC_SMP_IDLE_THREAD
> >  	select GENERIC_STRNCPY_FROM_USER
> 
> Hi Thomas,
> It looks you removed GENERIC_IRQ_SHOW by accident?

Indeed. My patch foo today is more than bad....

> I got this build error:
> ...
>   LD      vmlinux.o
>   MODPOST vmlinux.o
> fs/proc/interrupts.o:(.rodata+0x118): undefined reference to `show_interrupts'
> Makefile:1000: recipe for target 'vmlinux' failed
> make: *** [vmlinux] Error 1
> 
> Adding GENERIC_IRQ_SHOW back can fix the build failure, and with the
> pachset Hyper-V PCI pass-through can work fine.

Thanks for testing.

       tglx