linux-kernel - Re: [PATCH 1/2] MIPS: Malta: Fix i8259 irqchip setup

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Date:   Fri, 31 Mar 2017 13:53:15 +0100
From:   Matt Redfearn <matt.redfearn@...tec.com>
To:     Ralf Baechle <ralf@...ux-mips.org>
CC:     James Hogan <james.hogan@...tec.com>, <linux-mips@...ux-mips.org>,
        <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...tec.com>
Subject: Re: [PATCH 1/2] MIPS: Malta: Fix i8259 irqchip setup

Hi Ralf,


On 31/03/17 13:49, Ralf Baechle wrote:
> On Fri, Mar 31, 2017 at 12:05:31PM +0100, Matt Redfearn wrote:
>
>> diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
>> index cb675ec6f283..474b372e0dd9 100644
>> --- a/arch/mips/mti-malta/malta-int.c
>> +++ b/arch/mips/mti-malta/malta-int.c
>> @@ -232,6 +232,19 @@ void __init arch_init_irq(void)
>>   {
>>   	int corehi_irq;
>>   
>> +#ifdef CONFIG_I8259
>> +	/*
>> +	 * Preallocate the i8259's expected virq's here. Since irqchip_init()
>> +	 * will probe the irqchips in hierarchial order, i8259 is probed last.
>> +	 * If anything allocates a virq before the i8259 is probed, it will
>> +	 * be given one of the i8259's expected range and consequently setup
>> +	 * of the i8259 will fail.
>> +	 */
>> +	WARN(irq_alloc_descs(I8259A_IRQ_BASE, I8259A_IRQ_BASE,
>> +			    16, numa_node_id()) < 0,
>> +		"Cannot reserve i8259 virqs at IRQ%d\n", I8259A_IRQ_BASE);
>> +#endif /* CONFIG_I8259 */
>> +
>>   	i8259_set_poll(mips_pcibios_iack);
> CONFIG_I8259 is always defined on Malta so the #ifdef is pointless.
>
>    Ralf

Ah, true. I was looking at arch/mips/include/asm/mach-generic/irq.h 
where I8259A_IRQ_BASE is defined, it's wrapped in that CONFIG so I kept 
it here, but you're right of course that Malta always defines it. Would 
you like a v2 with that removed?

Thanks,
Matt