linux-kernel - Re: mmotm 2020-03-30-18-46 uploaded (VDPA + vhost)

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Date:   Tue, 31 Mar 2020 14:37:56 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     akpm@...ux-foundation.org, broonie@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-next@...r.kernel.org, mhocko@...e.cz,
        mm-commits@...r.kernel.org, sfr@...b.auug.org.au,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>
Subject: Re: mmotm 2020-03-30-18-46 uploaded (VDPA + vhost)

On Tue, Mar 31, 2020 at 11:27:54AM -0700, Randy Dunlap wrote:
> On 3/30/20 6:47 PM, akpm@...ux-foundation.org wrote:
> > The mm-of-the-moment snapshot 2020-03-30-18-46 has been uploaded to
> > 
> >    http://www.ozlabs.org/~akpm/mmotm/
> > 
> > mmotm-readme.txt says
> > 
> > README for mm-of-the-moment:
> > 
> > http://www.ozlabs.org/~akpm/mmotm/
> > 
> > This is a snapshot of my -mm patch queue.  Uploaded at random hopefully
> > more than once a week.
> > 
> > You will need quilt to apply these patches to the latest Linus release (5.x
> > or 5.x-rcY).  The series file is in broken-out.tar.gz and is duplicated in
> > http://ozlabs.org/~akpm/mmotm/series
> > 
> > The file broken-out.tar.gz contains two datestamp files: .DATE and
> > .DATE-yyyy-mm-dd-hh-mm-ss.  Both contain the string yyyy-mm-dd-hh-mm-ss,
> > followed by the base kernel version against which this patch series is to
> > be applied.
> > 
> > This tree is partially included in linux-next.  To see which patches are
> > included in linux-next, consult the `series' file.  Only the patches
> > within the #NEXT_PATCHES_START/#NEXT_PATCHES_END markers are included in
> > linux-next.
> > 
> > 
> > A full copy of the full kernel tree with the linux-next and mmotm patches
> > already applied is available through git within an hour of the mmotm
> > release.  Individual mmotm releases are tagged.  The master branch always
> > points to the latest release, so it's constantly rebasing.
> > 
> > 	https://github.com/hnaz/linux-mm
> 
> on i386:
> 
> ld: drivers/vhost/vdpa.o: in function `vhost_vdpa_init':
> vdpa.c:(.init.text+0x52): undefined reference to `__vdpa_register_driver'
> ld: drivers/vhost/vdpa.o: in function `vhost_vdpa_exit':
> vdpa.c:(.exit.text+0x14): undefined reference to `vdpa_unregister_driver'
> 
> 
> 
> drivers/virtio/vdpa/ is not being built. (confusing!)
> 
> CONFIG_VIRTIO=m
> # CONFIG_VIRTIO_MENU is not set
> CONFIG_VDPA=y

Hmm. OK. Can't figure it out. CONFIG_VDPA is set why isn't
drivers/virtio/vdpa/ built?
we have:


obj-$(CONFIG_VDPA) += vdpa/

and under that:

obj-$(CONFIG_VDPA) += vdpa.o


> CONFIG_VDPA_MENU=y
> # CONFIG_VDPA_SIM is not set
> CONFIG_VHOST_IOTLB=y
> CONFIG_VHOST_RING=m
> CONFIG_VHOST=y
> CONFIG_VHOST_SCSI=m
> CONFIG_VHOST_VDPA=y
> 
> Full randconfig file is attached.
> 
> (This same build failure happens with today's linux-next, Mar. 31.)
> 
> @Yamada-san:  Is this a kbuild problem (or feature)?
> 
> -- 
> ~Randy
> Reported-by: Randy Dunlap <rdunlap@...radead.org>