netdev - Re: [PATCH] [net-next] ARM: orion: fix PHYLIB dependency

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Date:   Thu, 9 Feb 2017 18:22:11 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jason Cooper <jason@...edaemon.net>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [net-next] ARM: orion: fix PHYLIB dependency

On Thu, Feb 09, 2017 at 04:08:11PM +0100, Arnd Bergmann wrote:
> The newly introduced mdiobus_register_board_info() function is only available
> as part of PHYLIB, so we get a link error when we call that from a board while
> phylib is disabled:
> 
> arch/arm/plat-orion/common.o: In function `orion_ge00_switch_init':
> common.c:(.init.text+0x6a4): undefined reference to `mdiobus_register_board_info'
> 
> This adds a workaround that is made up of three parts:
> 
> - in plat-orion, the function for declaring the switch is hidden without
>   PHYLIB.
> - in mach-orion5x, the caller conditionally stubs out the call to
>   the removed function, so we can still build other orion5x boards
>   without PHYLIB
> - For the boards that actually declare the switch, we select PHYLIB
>   explicitly from Kconfig if NETDEVICES is set. Without NETDEVICES,
>   we cannot enable PHYLIB, but we also wouldn't need it.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew