Subject: [PATCH] RM: shmobile: lager: phy fixup needs CONFIG_PHYLIB

From: [email-masked] (Sergei Shtylyov)
Date: Tue, 05 Nov 2013 20:53:06 +0300

Hello.

On 11/05/2013 02:58 AM, Simon Horman wrote:

>>>>> Do not build the phy fixup unless CONFIG_PHYLIB is enabled.
>>>>> Other than not being useful it is also not possible to compile

>>>>     s/compile/link/.

>>>>> the code under this condition as phy_register_fixup_for_id()
>>>>> is not defined.

>>>>     Not only this function is absent...

>>>>> This problem was introduced by 48c8b96f21817aad
>>>>> ("ARM: shmobile: Lager: add Micrel KSZ8041 PHY fixup")

>>>>> Cc: Sergei Shtylyov <[email-masked]>
>>>>> Signed-off-by: Simon Horman <[email-masked]>
>>>>> ---
>>>>>   arch/arm/mach-shmobile/board-lager.c | 4 +++-
>>>>>   1 file changed, 3 insertions(+), 1 deletion(-)

>>>>> diff --git a/arch/arm/mach-shmobile/board-lager.c b/arch/arm/mach-shmobile/board-lager.c
>>>>> index 78a31b6..d1a8ddd 100644
>>>>> --- a/arch/arm/mach-shmobile/board-lager.c
>>>>> +++ b/arch/arm/mach-shmobile/board-lager.c
>>>>> @@ -245,7 +245,9 @@ static void __init lager_init(void)
>>>>>   {
>>>>>   	lager_add_standard_devices();
>>>>>
>>>>> -	phy_register_fixup_for_id("r8a7790-ether-ff:01", lager_ksz8041_fixup);
>>>>> +	if (IS_ENABLED(CONFIG_PHYLIB))
>>>>> +		phy_register_fixup_for_id("r8a7790-ether-ff:01",
>>>>> +					  lager_ksz8041_fixup);

>>>>     Perhaps you would consider enclosing the fixup function itself
>>>> into #ifdef as it causes link errors as well?  Doesn't seem
>>>> necessary as gcc probably drops it anyway but for completeness'
>>>> sake...

>>> My understanding of the motivation for IS_ENABLED() is to
>>> take advantage of gcc optimising away unused code and making such
>>> problems disappear.

>>> With this patch in place do you still see any warnings?

>>     No (but those were errors :-).
>>     I'd like the changelog to be adjusted at least...

> Sure. Would you like me to list in the changelog the compile problems that
> gcc reports without this patch?

    Erm... gcc doesn't report any compile problems, it's ld that does report 
link errors. That would be good to include them, yes.

> Or do you have something else in mind?

    See the top of the mail for my comments to the changelog. Also, you need 
to fix the subject which has "RM:" instead of "ARM:"...

WBR, Sergei