linux-kernel - Re: [PATCH] net: of/phy: fix build error when phylib is built as a module

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Message-ID: <4FAD532E.401@gmail.com>
Date:	Fri, 11 May 2012 10:58:06 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Bjørn Mork <bjorn@...k.no>,
	David Miller <davem@...emloft.net>
CC:	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	"rdunlap@...otime.net" <rdunlap@...otime.net>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] net: of/phy: fix build error when phylib is built as
 a module

On 05/11/2012 08:47 AM, Bjørn Mork wrote:
> CONFIG_OF_MDIO is tristate and will be m if PHYLIB is m.  Use
> IS_ENABLED macro to prevent build error:
>
>   ERROR: "of_mdio_find_bus" [drivers/net/phy/mdio-mux.ko] undefined!
>
> Reported-by: Randy Dunlap<rdunlap@...otime.net>
> Cc: David Daney<david.daney@...ium.com>
> Signed-off-by: Bjørn Mork<bjorn@...k.no>

I was able to reproduce the failure, and this patch both fixes it and 
seems correct, so...

Acked-by: David Daney<david.daney@...ium.com>

Sorry about this failure.


> ---
> I wonder if this could be as banal as this?  Not even build tested...
>
> Should be wrapped into commit 25106022 if it works, to ensure
> bisectability.
>
>
>
> Bjørn
>
>   drivers/net/phy/mdio_bus.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index 83d5c9f..683ef1c 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -88,7 +88,7 @@ static struct class mdio_bus_class = {
>   	.dev_release	= mdiobus_release,
>   };
>
> -#ifdef CONFIG_OF_MDIO
> +#if IS_ENABLED(CONFIG_OF_MDIO)
>   /* Helper function for of_mdio_find_bus */
>   static int of_mdio_bus_match(struct device *dev, void *mdio_bus_np)
>   {

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