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

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Date:   Mon, 26 Mar 2018 06:54:56 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Marc Zyngier <marc.zyngier@....com>
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 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.

Thanks,
Davidlohr