On 2020/9/18 上午3:45, Randy Dunlap wrote:
From: Randy Dunlap <rdun...@infradead.org>

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 <rdun...@infradead.org>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Cc: Jason Wang <jasow...@redhat.com>
Cc: virtualizat...@lists.linux-foundation.org
Cc: Saeed Mahameed <sae...@nvidia.com>
Cc: Leon Romanovsky <leo...@nvidia.com>
Cc: net...@vger.kernel.org
---
v2: change from select to depends (Saeed)

  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 && MLX5_CORE


It looks to me that depending on VHOST is too heavyweight.

I guess what it really needs is VHOST_IOTLB. So we can use select VHOST_IOTLB here.

Thanks


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


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