linux-kernel - Re: [PATCH 2/3] drivers/irqchip: update supports

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Date:   Mon, 26 Mar 2018 15:24:11 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Davidlohr Bueso <dave@...olabs.net>
Cc:     peterz@...radead.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 2/3] drivers/irqchip: update supports_deactivate static
 key to modern api

On 26/03/18 14:54, Davidlohr Bueso wrote:
> On Mon, 26 Mar 2018, Marc Zyngier wrote:
> 
>>>  static struct gic_chip_data gic_data __read_mostly;
>>> -static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
>>> +DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
>>
>> When you combine this...
>>
>> [...]
>>
>>> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
>>> index ac2e62d613d1..9b7630cee56c 100644
>>> --- a/drivers/irqchip/irq-gic.c
>>> +++ b/drivers/irqchip/irq-gic.c
>>> @@ -121,7 +121,7 @@ static DEFINE_RAW_SPINLOCK(cpu_map_lock);
>>>  #define NR_GIC_CPU_IF 8
>>>  static u8 gic_cpu_map[NR_GIC_CPU_IF] __read_mostly;
>>>
>>> -static struct static_key supports_deactivate = STATIC_KEY_INIT_TRUE;
>>> +DEFINE_STATIC_KEY_TRUE(supports_deactivate_key);
>>
>> ...with that, bad things happen:
>>
>> drivers/irqchip/irq-gic-v3.o:(.data+0x278): multiple definition of `supports_deactivate_key'
>> drivers/irqchip/irq-gic.o:(.data+0x18): first defined here
>> Makefile:1032: recipe for target 'vmlinux' failed
>> make: *** [vmlinux] Error 1
> 
> Hmm both were (cross) compile tested, I'll have a look.

Odd. I don't see how you can avoid this failure at link time...

	M.
-- 
Jazz is not dead. It just smells funny...