linux-kernel - Re: [PATCH v5 11/20] ARC: IPI: do not use generic IRQ domain

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Date:	Thu, 31 Dec 2015 05:14:34 +0000
From:	Noam Camus <noamc@...hip.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"linux-snps-arc@...ts.infradead.org" 
	<linux-snps-arc@...ts.infradead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Chris Metcalf" <cmetcalf@...hip.com>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"marc.zyngier@....com" <marc.zyngier@....com>
Subject: Re: [PATCH v5 11/20] ARC: IPI: do not use generic IRQ domain

>From: Vineet Gupta <Vineet.Gupta1@...opsys.com>
>Sent: Wednesday, December 30, 2015 12:13 PM

>>  generic-y += fb.h
>>  generic-y += fcntl.h
>>  generic-y += ftrace.h
>> -generic-y += hardirq.h

>So this is going backwards - copy/paste generic code into arch header
I don't understand why you need this !

I need an extra field (ipi_irqs) at struct irq_cpustat_t and I cannot do this at asm-generic.

See below that how I use it to save and show status for each cpu

>> +void arch_do_IPI(unsigned int irq, struct pt_regs *regs)
>> +{
>> +     struct pt_regs *old_regs = set_irq_regs(regs);
>> +     unsigned int cpu = smp_processor_id();
>> +
>> +     __IRQ_STAT(cpu, ipi_irqs)++;
>> +
>> +     irq_enter();
>> +     do_IPI(irq, NULL);
>> +     irq_exit();
>> +
>> +     set_irq_regs(old_regs);
>> +}

>WHY ?

Please explain
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