linux-kernel - Re: [PATCH v3] ARM: at91: Fix link breakage when !CONFIG

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Date:	Mon, 27 May 2013 20:59:14 +0800
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Ludovic Desroches <ludovic.desroches@...el.com>
Subject: Re: [PATCH v3] ARM: at91: Fix link breakage when !CONFIG_PHYLIB


On May 27, 2013, at 8:50 PM, Alexandre Belloni <alexandre.belloni@...e-electrons.com> wrote:

> On 27/05/2013 13:26, Jean-Christophe PLAGNIOL-VILLARD wrote:
>> On May 27, 2013, at 6:48 PM, Alexandre Belloni <alexandre.belloni@...e-electrons.com> wrote:
>> 
>>> Fixes:
>>> arch/arm/mach-at91/built-in.o: In function `ksz9021rn_phy_fixup':
>>> :(.text+0x1174): undefined reference to `mdiobus_write'
>>> :(.text+0x1188): undefined reference to `mdiobus_write'
>>> :(.text+0x119c): undefined reference to `mdiobus_write'
>>> :(.text+0x11b0): undefined reference to `mdiobus_write'
>>> arch/arm/mach-at91/built-in.o: In function `sama5_dt_device_init':
>>> :(.init.text+0x1e34): undefined reference to `phy_register_fixup_for_uid'
>>> 
>>> when CONFIG_PHYLIB is not selected.
>>> 
>>> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
>>> Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>
>> no for this change
>> 
>> add an inline version of phy_register_fixup_for_uid
>> 
>> this will do the same for every platform
> 
> I don't actually see the added value of doing that. Using IS_BUILTIN is
> readable and ensure that you will definitely be able to link. The
> functions will be optimized out and removed by gcc even when you have
> CONFIG_PHYLIB=m.

no will not as you do ifdef CONFIG_PHYLIB and if CONFIG_PHYLIB=m the macro is defended

we do this all the time in the kernel

I add the IS_BUILTIN & co to be used when a simple inline is not sufficient

Best Regards,
J/
> 
>>> ---
>>> Changes in v3:
>>> 	added SoB
>>> 	added Acked-By
>>> 
>>> Changes in v2:
>>> 	use IS_BUILTIN
>>> 	use CONFIG_PHYLIB and not CONFIG_PHY
>>> 
>>> arch/arm/mach-at91/board-dt-sama5.c | 22 ++++++++++++----------
>>> 1 file changed, 12 insertions(+), 10 deletions(-)
>>> 
>>> diff --git a/arch/arm/mach-at91/board-dt-sama5.c b/arch/arm/mach-at91/board-dt-sama5.c
>>> index 705305e..e9ce541 100644
>>> --- a/arch/arm/mach-at91/board-dt-sama5.c
>>> +++ b/arch/arm/mach-at91/board-dt-sama5.c
>>> @@ -47,22 +47,24 @@ static int ksz9021rn_phy_fixup(struct phy_device *phy)
>>> #define GMII_ERCR	11
>>> #define GMII_ERDWR	12
>>> 
>>> -	/* Set delay values */
>>> -	value = GMII_RCCPSR | 0x8000;
>>> -	phy_write(phy, GMII_ERCR, value);
>>> -	value = 0xF2F4;
>>> -	phy_write(phy, GMII_ERDWR, value);
>>> -	value = GMII_RRDPSR | 0x8000;
>>> -	phy_write(phy, GMII_ERCR, value);
>>> -	value = 0x2222;
>>> -	phy_write(phy, GMII_ERDWR, value);
>>> +	if (IS_BUILTIN(CONFIG_PHYLIB)) {
>>> +		/* Set delay values */
>>> +		value = GMII_RCCPSR | 0x8000;
>>> +		phy_write(phy, GMII_ERCR, value);
>>> +		value = 0xF2F4;
>>> +		phy_write(phy, GMII_ERDWR, value);
>>> +		value = GMII_RRDPSR | 0x8000;
>>> +		phy_write(phy, GMII_ERCR, value);
>>> +		value = 0x2222;
>>> +		phy_write(phy, GMII_ERDWR, value);
>>> +	}
>>> 
>>> 	return 0;
>>> }
>>> 
>>> static void __init sama5_dt_device_init(void)
>>> {
>>> -	if (of_machine_is_compatible("atmel,sama5d3xcm"))
>>> +	if (of_machine_is_compatible("atmel,sama5d3xcm") && IS_BUILTIN(CONFIG_PHYLIB))
>>> 		phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
>>> 			ksz9021rn_phy_fixup);
>>> 
>>> -- 
>>> 1.8.1.2
>>> 
> 
> 
> -- 
> Alexandre Belloni, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
> 

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