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

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Message-ID: <536d6fe7-f4b1-09bb-0883-b03d6f60a229@de.ibm.com>
Date:   Wed, 24 Feb 2021 13:30:26 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
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>,
        Guenter Roeck <linux@...ck-us.net>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: [PATCH V4 1/3] virtio: don't prompt CONFIG_VIRTIO_PCI_MODERN



On 23.02.21 07:19, 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>

Michael,

Can we please add this NOW to next? virtio-pci is broken without it on
many defconfigs including s390. So linux-next is broken for more than 
2 weeks now and it actively breaks several parts of our CI.
I guess there are other CIs that will not run several testcases because
of this. And Naresh reported that on Feb 9th.
There IS value in CI tools on next. Not caring about regressions introduced
by a tree in next is harmful. Especially when we are close or in the
merge window. So please: either fix things quickly OR revert.

Christian



> ---
>  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.
>  
>  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
>