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

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Date:	Mon, 27 May 2013 14:50:42 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
CC:	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 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.

>> ---
>> 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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