RE: [patch 3/3] x86/vector/msi: Select CONFIG_GENERIC_IRQ_RESERVATION_MODE

[Dexuan Cui]

> From: Thomas Gleixner [mailto:tglx@xxxxxxxxxxxxx]
> 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