path: root/net/Kconfig
diff options
authorArnd Bergmann <arnd@arndb.de>2016-03-02 10:40:54 +0100
committerDavid S. Miller <davem@davemloft.net>2016-03-03 17:08:59 -0500
commit3d1cbe839ac3aa7b23a274b691092c90f9bf1b8e (patch)
treebd4b678b6109d6714e0bfd4a8337a9254f224ccb /net/Kconfig
parentMerge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next (diff)
net: mellanox: add DEVLINK dependencies
The new NET_DEVLINK infrastructure can be a loadable module, but the drivers using it might be built-in, which causes link errors like: drivers/net/built-in.o: In function `mlx4_load_one': :(.text+0x2fbfda): undefined reference to `devlink_port_register' :(.text+0x2fc084): undefined reference to `devlink_port_unregister' drivers/net/built-in.o: In function `mlxsw_sx_port_remove': :(.text+0x33a03a): undefined reference to `devlink_port_type_clear' :(.text+0x33a04e): undefined reference to `devlink_port_unregister' There are multiple ways to avoid this: a) add 'depends on NET_DEVLINK || !NET_DEVLINK' dependencies for each user b) use 'select NET_DEVLINK' from each driver that uses it and hide the symbol in Kconfig. c) make NET_DEVLINK a 'bool' option so we don't have to list it as a dependency, and rely on the APIs to be stubbed out when it is disabled d) use IS_REACHABLE() rather than IS_ENABLED() to check for NET_DEVLINK in include/net/devlink.h This implements a variation of approach a) by adding an intermediate symbol that drivers can depend on, and changes the three drivers using it. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 09d4d087cd48 ("mlx4: Implement devlink interface") Fixes: c4745500e988 ("mlxsw: Implement devlink interface") Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/Kconfig')
1 files changed, 9 insertions, 0 deletions
diff --git a/net/Kconfig b/net/Kconfig
index 6c9cfb0d7639..2760825e53fa 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -403,6 +403,15 @@ config NET_DEVLINK
infrastructure to support access to physical chip-wide config and
+ tristate
+ default m if NET_DEVLINK=m
+ default y if NET_DEVLINK=y || NET_DEVLINK=n
+ help
+ Drivers using the devlink infrastructure should have a dependency
+ on MAY_USE_DEVLINK to ensure they do not cause link errors when
+ devlink is a loadable module and the driver using it is built-in.
endif # if NET
# Used by archs to tell that they support BPF_JIT