Subject: Re: [PATCH v2] net: mdio-octeon: Fix Kconfig warnings and build errors

From: Randy Dunlap <[email-masked]>
Date: Sat, 3 Aug 2019 11:34:16 -0700

On 8/2/19 11:01 PM, Nathan Chancellor wrote:
> After commit 171a9bae68c7 ("staging/octeon: Allow test build on
> !MIPS"), the following combination of configs cause a few Kconfig
> warnings and build errors (distilled from arm allyesconfig and Randy's
> randconfig builds):
> 
>     CONFIG_NETDEVICES=y
>     CONFIG_STAGING=y
>     CONFIG_COMPILE_TEST=y
> 
> and CONFIG_OCTEON_ETHERNET as either a module or built-in.
> 
> WARNING: unmet direct dependencies detected for MDIO_OCTEON
>   Depends on [n]: NETDEVICES [=y] && MDIO_DEVICE [=y] && MDIO_BUS [=y]
> && 64BIT [=n] && HAS_IOMEM [=y] && OF_MDIO [=n]
>   Selected by [y]:
>   - OCTEON_ETHERNET [=y] && STAGING [=y] && (CAVIUM_OCTEON_SOC ||
> COMPILE_TEST [=y]) && NETDEVICES [=y]
> 
> In file included from ../drivers/net/phy/mdio-octeon.c:14:
> ../drivers/net/phy/mdio-cavium.h:111:36: error: implicit declaration of
> function ‘writeq’; did you mean ‘writel’?
> [-Werror=implicit-function-declaration]
>   111 | #define oct_mdio_writeq(val, addr) writeq(val, (void *)addr)
>       |                                    ^~~~~~
> 
> CONFIG_64BIT is not strictly necessary if the proper readq/writeq
> definitions are included from io-64-nonatomic-lo-hi.h.
> 
> CONFIG_OF_MDIO is not needed when CONFIG_COMPILE_TEST is enabled because
> of commit f9dc9ac51610 ("of/mdio: Add dummy functions in of_mdio.h.").
> 
> Fixes: 171a9bae68c7 ("staging/octeon: Allow test build on !MIPS")
> Reported-by: kbuild test robot <[email-masked]>
> Reported-by: Mark Brown <[email-masked]>
> Reported-by: Randy Dunlap <[email-masked]>
> Signed-off-by: Nathan Chancellor <[email-masked]>

Works for me. Fixes the reported build errors.  Thanks.

Acked-by: Randy Dunlap <[email-masked]> # build-tested

> ---
> 
> v1 -> v2:
> 
> * Address Randy's reported failure here: https://lore.kernel.org/netdev/[email-masked]/
>   by not requiring CONFIG_OF_MDIO when CONFIG_COMPILE_TEST is set.
> 
> * Improve commit message
> 
>  drivers/net/phy/Kconfig       | 4 ++--
>  drivers/net/phy/mdio-cavium.h | 2 ++
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 20f14c5fbb7e..0e3d9e3d3533 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -159,8 +159,8 @@ config MDIO_MSCC_MIIM
>  
>  config MDIO_OCTEON
>  	tristate "Octeon and some ThunderX SOCs MDIO buses"
> -	depends on 64BIT
> -	depends on HAS_IOMEM && OF_MDIO
> +	depends on (64BIT && OF_MDIO) || COMPILE_TEST
> +	depends on HAS_IOMEM
>  	select MDIO_CAVIUM
>  	help
>  	  This module provides a driver for the Octeon and ThunderX MDIO
> diff --git a/drivers/net/phy/mdio-cavium.h b/drivers/net/phy/mdio-cavium.h
> index ed5f9bb5448d..b7f89ad27465 100644
> --- a/drivers/net/phy/mdio-cavium.h
> +++ b/drivers/net/phy/mdio-cavium.h
> @@ -108,6 +108,8 @@ static inline u64 oct_mdio_readq(u64 addr)
>  	return cvmx_read_csr(addr);
>  }
>  #else
> +#include <linux/io-64-nonatomic-lo-hi.h>
> +
>  #define oct_mdio_writeq(val, addr)	writeq(val, (void *)addr)
>  #define oct_mdio_readq(addr)		readq((void *)addr)
>  #endif
> 

-- 
~Randy