linux-kernel - Re: [PATCH v2 04/19] genirq: Add new struct ipi

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Date:	Mon, 30 Nov 2015 13:57:35 +0000
From:	Qais Yousef <qais.yousef@...tec.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	<linux-kernel@...r.kernel.org>, <jason@...edaemon.net>,
	<marc.zyngier@....com>, <jiang.liu@...ux.intel.com>,
	<ralf@...ux-mips.org>, <linux-mips@...ux-mips.org>
Subject: Re: [PATCH v2 04/19] genirq: Add new struct ipi_mask and helper
 functions

On 11/30/2015 01:11 PM, Thomas Gleixner wrote:
> On Mon, 30 Nov 2015, Qais Yousef wrote:
>>
>> Yes it would be much better to reuse it but wouldn't the runtime checks
>> against nr_cpu_ids create problems especially when CPUMASK_ON_STACK is
>> defined?
> nr_cpu_ids == find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
>
>


OK. I can partially see your point. I can't see how the extra 
coprocessor bits will be set in cpu_possible_mask and whether this will 
affect normal linux operation (ie: will it think it can bring that cpu 
up or migrate irqs to it?).

Since you don't see an issue with it, it must be just a missing gap in 
my knowledge that I'll fill while doing this work.

Thanks,
Qais
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