Re: mmotm 2014-03-10-15-35 uploaded (virtio_balloon)

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On Tue, 11 Mar 2014 12:20:46 -0700 Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote:

> > > ERROR: "balloon_devinfo_alloc" [drivers/virtio/virtio_balloon.ko] undefined!
> > > ERROR: "balloon_page_enqueue" [drivers/virtio/virtio_balloon.ko] undefined!
> > > ERROR: "balloon_page_dequeue" [drivers/virtio/virtio_balloon.ko] undefined!
> > > 
> > > when loadable module
> > > 
> > > or
> > > 
> > > virtio_balloon.c:(.text+0x1fa26): undefined reference to `balloon_page_enqueue'
> > > virtio_balloon.c:(.text+0x1fb87): undefined reference to `balloon_page_dequeue'
> > > virtio_balloon.c:(.text+0x1fdf1): undefined reference to `balloon_devinfo_alloc'
> > > 
> > > when builtin.
> > 
> > OK, thanks, I'll drop
> > http://ozlabs.org/~akpm/mmots/broken-out/mm-disable-mm-balloon_compactionc-completely-when-config_balloon_compaction.patch
> 
> Sorry about that; I missed that case in my testing.  It always seems
> strange that the dependency goes that way around.
> 
> With virtio-balloon being the one and only user of this API, would it be
> reasonable to just only compile in balloon_compaction.o when
> CONFIG_VIRTIO_BALLOON?

Better to make VIRTIO_BALLOON depend on (or select) BALLOON_COMPACTION.
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