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

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Date:   Tue, 17 Oct 2017 18:59:27 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "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

> 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?

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,
-- Dexuan