Subject: Re: [PATCH v3 -next] vdpa: mlx5: change Kconfig depends to fix build errors

From: "Michael S. Tsirkin" <[email-masked]>
Date: Thu, 24 Sep 2020 05:30:55 -0400

On Fri, Sep 18, 2020 at 11:22:45AM +0300, Leon Romanovsky wrote:
> On Thu, Sep 17, 2020 at 07:35:03PM -0700, Randy Dunlap wrote:
> > From: Randy Dunlap <[email-masked]>
> >
> > drivers/vdpa/mlx5/ uses vhost_iotlb*() interfaces, so add a dependency
> > on VHOST to eliminate build errors.
> >
> > ld: drivers/vdpa/mlx5/core/mr.o: in function `add_direct_chain':
> > mr.c:(.text+0x106): undefined reference to `vhost_iotlb_itree_first'
> > ld: mr.c:(.text+0x1cf): undefined reference to `vhost_iotlb_itree_next'
> > ld: mr.c:(.text+0x30d): undefined reference to `vhost_iotlb_itree_first'
> > ld: mr.c:(.text+0x3e8): undefined reference to `vhost_iotlb_itree_next'
> > ld: drivers/vdpa/mlx5/core/mr.o: in function `_mlx5_vdpa_create_mr':
> > mr.c:(.text+0x908): undefined reference to `vhost_iotlb_itree_first'
> > ld: mr.c:(.text+0x9e6): undefined reference to `vhost_iotlb_itree_next'
> > ld: drivers/vdpa/mlx5/core/mr.o: in function `mlx5_vdpa_handle_set_map':
> > mr.c:(.text+0xf1d): undefined reference to `vhost_iotlb_itree_first'
> >
> > Signed-off-by: Randy Dunlap <[email-masked]>
> > Cc: "Michael S. Tsirkin" <[email-masked]>
> > Cc: Jason Wang <[email-masked]>
> > Cc: [email-masked]
> > Cc: Saeed Mahameed <[email-masked]>
> > Cc: Leon Romanovsky <[email-masked]>
> > Cc: [email-masked]
> > ---
> > v2: change from select to depends on VHOST (Saeed)
> > v3: change to depends on VHOST_IOTLB (Jason)
> >
> >  drivers/vdpa/Kconfig |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > --- linux-next-20200917.orig/drivers/vdpa/Kconfig
> > +++ linux-next-20200917/drivers/vdpa/Kconfig
> > @@ -31,7 +31,7 @@ config IFCVF
> >
> >  config MLX5_VDPA
> >  	bool "MLX5 VDPA support library for ConnectX devices"
> > -	depends on MLX5_CORE
> > +	depends on VHOST_IOTLB && MLX5_CORE
> >  	default n
> 
> While we are here, can anyone who apply this patch delete the "default n" line?
> It is by default "n".
> 
> Thanks

Hmm other drivers select VHOST_IOTLB, why not do the same?

> >  	help
> >  	  Support library for Mellanox VDPA drivers. Provides code that is
> >