linux-kernel - Re: [PATCH 6/9] PCI: consolidate PCI config entry in drivers/pci

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Date:   Fri, 19 Oct 2018 11:18:22 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     Christoph Hellwig <hch@....de>
CC:     yamada.masahiro@...ionext.com, mporter@...nel.crashing.org,
        alex.bou9@...il.com, linux@...inikbrodowski.net,
        linux-kbuild@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject:     Re: [PATCH 6/9] PCI: consolidate PCI config entry in drivers/pci

On Fri, 19 Oct 2018 05:09:49 PDT (-0700), Christoph Hellwig wrote:
> There is no good reason to duplicate the PCI menu in every architecture.
> Instead provide a selectable HAVE_PCI symbol that indicates availability
> of PCI support and the handle the rest in drivers/pci.
>
> Note that for powerpc we now select HAVE_PCI globally instead of the
> convoluted mess of conditional or or non-conditional support per board,
> similar to what we do e.g. on x86.  For alpha PCI is selected for the
> non-jensen configs as it was the default before, and a lot of code does
> not compile without PCI enabled.  On other architectures with limited
> PCI support that wasn't as complicated I've left the selection as-is.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Acked-by: Max Filippov <jcmvbkbc@...il.com>
> Acked-by: Thomas Gleixner <tglx@...utronix.de>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

...

> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index a344980287a5..071952cd4cae 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -39,8 +39,10 @@ config RISCV
>  	select SPARSE_IRQ
>  	select SYSCTL_EXCEPTION_TRACE
>  	select HAVE_ARCH_TRACEHOOK
> +	select HAVE_PCI
>  	select MODULES_USE_ELF_RELA if MODULES
>  	select THREAD_INFO_IN_TASK
> +	select PCI_MSI if PCI
>  	select RISCV_TIMER
>  	select GENERIC_IRQ_MULTI_HANDLER
>  	select ARCH_HAS_PTE_SPECIAL
> @@ -216,28 +218,12 @@ source "kernel/Kconfig.hz"
>
>  endmenu
>
> -menu "Bus support"
> -
> -config PCI
> -	bool "PCI support"
> -	select PCI_MSI
> -	help
> -	  This feature enables support for PCI bus system. If you say Y
> -	  here, the kernel will include drivers and infrastructure code
> -	  to support PCI bus devices.
> -
> -	  If you don't know what to do here, say Y.
> -
>  config PCI_DOMAINS
>  	def_bool PCI
>
>  config PCI_DOMAINS_GENERIC
>  	def_bool PCI
>
> -source "drivers/pci/Kconfig"
> -
> -endmenu
> -
>  menu "Power management options"
>
>  source kernel/power/Kconfig

Reviewed-by: Palmer Dabbelt <palmer@...ive.com>

I'm assuming this will go in via PCI tree of some sort, so I'm not going to 
touch it any further.

Thanks for cleaning this up!