[PATCH net-next v2] net: pcs: xpcs: select PHYLINK in Kconfig

[PATCH net-next v2] net: pcs: xpcs: select PHYLINK in Kconfig

[Paolo Abeni]

This is another attempt at fixing:

>> ERROR: modpost: "phylink_mii_c22_pcs_encode_advertisement" [drivers/net/pcs/pcs_xpcs.ko] undefined!
>> ERROR: modpost: "phylink_mii_c22_pcs_decode_state" [drivers/net/pcs/pcs_xpcs.ko] undefined!

We can't mix select and depends, or that will trigger a circular dependency.
We can't use 'depends on' for PHYLINK, as the latter config is not
user-visible.
Pull-in all the dependencies via 'select'.
Note that PHYLINK already selects PHYLIB, which in turn selects MDIO_DEVICE.

v1 -> v2:
 - use 'select' instead of 'depends on' (Jakub)

Link: https://lore.kernel.org/netdev/20220621125045.7e0a78c2@kernel.org/
Reported-by: kernel test robot <lkp@intel.com>
Fixes: b47aec885bcd ("net: pcs: xpcs: add CL37 1000BASE-X AN support")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 drivers/net/pcs/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/pcs/Kconfig b/drivers/net/pcs/Kconfig
index 22ba7b0b476d..59148d9654d5 100644
--- a/drivers/net/pcs/Kconfig
+++ b/drivers/net/pcs/Kconfig
@@ -7,7 +7,8 @@ menu "PCS device drivers"
 
 config PCS_XPCS
 	tristate "Synopsys DesignWare XPCS controller"
-	depends on MDIO_DEVICE && MDIO_BUS
+	select MDIO_BUS
+	select PHYLINK
 	help
 	  This module provides helper functions for Synopsys DesignWare XPCS
 	  controllers.
-- 
2.35.3

Re: [PATCH net-next v2] net: pcs: xpcs: select PHYLINK in Kconfig

[Russell King (Oracle)]

On Wed, Jun 22, 2022 at 04:31:56PM +0200, Paolo Abeni wrote:
> This is another attempt at fixing:
> 
> >> ERROR: modpost: "phylink_mii_c22_pcs_encode_advertisement" [drivers/net/pcs/pcs_xpcs.ko] undefined!
> >> ERROR: modpost: "phylink_mii_c22_pcs_decode_state" [drivers/net/pcs/pcs_xpcs.ko] undefined!
> 
> We can't mix select and depends, or that will trigger a circular dependency.
> We can't use 'depends on' for PHYLINK, as the latter config is not
> user-visible.
> Pull-in all the dependencies via 'select'.
> Note that PHYLINK already selects PHYLIB, which in turn selects MDIO_DEVICE.
> 
> v1 -> v2:
>  - use 'select' instead of 'depends on' (Jakub)

Why? I'm failing to understand the rationale here. See my reply to
Jakub sent a few minutes ago.

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