netdev - Re: Nested function in drivers/of/of

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Date:	Wed, 7 Oct 2009 08:55:57 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Jérôme Pouiller <jezz@...mic.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Andy Fleming <afleming@...escale.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Nested function in drivers/of/of_mdio.c

Please resend your question with both linuxppc-dev@...ts.ozlabs.org
and netdev@...r.kernel.org added to the cc: list.

g.

On Wed, Oct 7, 2009 at 8:29 AM, Jérôme Pouiller <jezz@...mic.org> wrote:
> Dear,
>
> I have a problem with commit 8bc487d150b939e69830c39322df4ee486efe381
> in file drivers/of/of_mdio.c in function of_phy_find_device.
>
> As you see, this function define match() as a nested function. My
> compiler (powerpc-e500-linux-gnu-gcc-3.4.1) raise an error during link
> due to this nested definition:
>  drivers/built-in.o(.text+0x5e2a4): In function `of_phy_find_device': /home/jezz/linux-next/drivers/of/of_mdio.c:107:
> undefined reference to `__trampoline_setup'
>
> I am sure I could solve problem by rebuilding my toolchain.
> Nevertheless, I think nested function definition is not perfectly
> supported by all compilers. Also, I suggest to place function match()
> outside of scope of of_phy_find_device as in following patch.
>
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index bacaa53..c7b2e26 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -97,6 +97,10 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
>  }
>  EXPORT_SYMBOL(of_mdiobus_register);
>
> +static int match(struct device *dev, void *phy_np)
> +{
> +       return dev_archdata_get_node(&dev->archdata) == phy_np;
> +}
>  /**
>  * of_phy_find_device - Give a PHY node, find the phy_device
>  * @phy_np: Pointer to the phy's device tree node
> @@ -106,11 +110,6 @@ EXPORT_SYMBOL(of_mdiobus_register);
>  struct phy_device *of_phy_find_device(struct device_node *phy_np)
>  {
>        struct device *d;
> -       int match(struct device *dev, void *phy_np)
> -       {
> -               return dev_archdata_get_node(&dev->archdata) == phy_np;
> -       }
> -
>        if (!phy_np)
>                return NULL;
>
>
> What do you think about it?
>
> Best regards,
>
> --
> Jérôme Pouiller (jezz AT sysmic DOT org)
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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