linux-kernel - Re: [PATCH V4 1/3] virtio: don't prompt CONFIG_VIRTIO_PCI

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Date:   Tue, 23 Feb 2021 07:22:16 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, shahafs@...lanox.com,
        sgarzare@...hat.com, rdunlap@...radead.org,
        Arnd Bergmann <arnd@...db.de>,
        Anders Roxell <anders.roxell@...aro.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Subject: Re: [PATCH V4 1/3] virtio: don't prompt CONFIG_VIRTIO_PCI_MODERN

On 2/22/21 10:19 PM, Jason Wang wrote:
> We used to prompt CONFIG_VIRTIO_PCI_MODERN to user which may bring a
> lot of confusion. E.g it may break various default configs which want
> virtio devices.
> 
> So this patch fixes this by hiding the prompot and documenting the
> dependency. While at it, rename the module to VIRTIO_PCI_LIB.
> 
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Anders Roxell <anders.roxell@...aro.org>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Fixes: 86b87c9d858b6 ("virtio-pci: introduce modern device module")
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/virtio/Kconfig  | 11 ++++++-----
>  drivers/virtio/Makefile |  2 +-
>  2 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
> index 6b9b81f4b8c2..ce1b3f6ec325 100644
> --- a/drivers/virtio/Kconfig
> +++ b/drivers/virtio/Kconfig
> @@ -12,13 +12,13 @@ config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
>  	  This option is selected if the architecture may need to enforce
>  	  VIRTIO_F_ACCESS_PLATFORM
>  
> -config VIRTIO_PCI_MODERN
> -	tristate "Modern Virtio PCI Device"
> -	depends on PCI
> +config VIRTIO_PCI_LIB
> +	tristate
>  	help
>  	  Modern PCI device implementation. This module implements the
>  	  basic probe and control for devices which are based on modern
> -	  PCI device with possible vendor specific extensions.
> +	  PCI device with possible vendor specific extensions. Any
> +	  module that selects this module must depend on PCI.

Nit: "depends on PCI" might have been useful here, since the config
system would then complain about any violations.

Thanks,
Guenter

>  
>  menuconfig VIRTIO_MENU
>  	bool "Virtio drivers"
> @@ -28,7 +28,8 @@ if VIRTIO_MENU
>  
>  config VIRTIO_PCI
>  	tristate "PCI driver for virtio devices"
> -	depends on VIRTIO_PCI_MODERN
> +	depends on PCI
> +	select VIRTIO_PCI_LIB
>  	select VIRTIO
>  	help
>  	  This driver provides support for virtio based paravirtual device
> diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
> index f097578aaa8f..699bbea0465f 100644
> --- a/drivers/virtio/Makefile
> +++ b/drivers/virtio/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
> -obj-$(CONFIG_VIRTIO_PCI_MODERN) += virtio_pci_modern_dev.o
> +obj-$(CONFIG_VIRTIO_PCI_LIB) += virtio_pci_modern_dev.o
>  obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
>  obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
>  virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
>