linux-kernel - Re: [PATCH] eni_vdpa: alibaba: select VIRTIO_PCI

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Date:   Mon, 6 Dec 2021 09:14:33 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Jason Wang <jasowang@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        Arnd Bergmann <arnd@...db.de>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Eli Cohen <elic@...dia.com>,
        Xie Yongji <xieyongji@...edance.com>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] eni_vdpa: alibaba: select VIRTIO_PCI_LIB

On Mon, Dec 6, 2021 at 4:12 AM Jason Wang <jasowang@...hat.com> wrote:
>
> On Sat, Dec 4, 2021 at 2:55 AM Arnd Bergmann <arnd@...nel.org> wrote:
> >
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > When VIRTIO_PCI_LIB is not built-in but the alibaba driver is, the
> > kernel runs into a link error:
> >
> > x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_features':
> > eni_vdpa.c:(.text+0x23f): undefined reference to `vp_legacy_set_features'
> > x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_vq_state':
> > eni_vdpa.c:(.text+0x2fe): undefined reference to `vp_legacy_get_queue_enable'
> > x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_vq_address':
> > eni_vdpa.c:(.text+0x376): undefined reference to `vp_legacy_set_queue_address'
> > x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_set_vq_ready':
> > eni_vdpa.c:(.text+0x3b4): undefined reference to `vp_legacy_set_queue_address'
> > x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_free_irq':
> > eni_vdpa.c:(.text+0x460): undefined reference to `vp_legacy_queue_vector'
> > x86_64-linux-ld: eni_vdpa.c:(.text+0x4b7): undefined reference to `vp_legacy_config_vector'
> > x86_64-linux-ld: drivers/vdpa/alibaba/eni_vdpa.o: in function `eni_vdpa_reset':
>
> Intersting, all those belongs to the legacy library.
>
> And I just have a try and I can complie alibaba eni without
> VIRTIO_PCI_LIB is set.

Ah, so the problem is in drivers/Makefile:

obj-$(CONFIG_VIRTIO)            += virtio/
obj-$(CONFIG_VIRTIO_PCI_LIB)    += virtio/

We only enter this directory when one of these two symbols is set, but
in my randconfig
build, neither one is. I'll send a new patch.

         Arnd