Re: [PATCH 07/14] genirq: Add a new generic IPI reservation code to irq core

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From	Qais Yousef <qais.yousef@imgtec.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 07/14] genirq: Add a new generic IPI reservation code to irq core
Date	Mon, 09 Nov 2015 11:20:04 +0100
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On 11/07/2015 01:31 PM, Thomas Gleixner wrote:
> On Tue, 3 Nov 2015, Qais Yousef wrote:
>> +
>> +	/* always allocate a virq per cpu */
>> +	nr_irqs = ipi_mask_weight(dest);
> That's not really a good assumption. Not all architectures need
> seperate interrupt numbers / descriptors because they can allocate
> from a per cpu interrupt space. We really want to handle that here as
> well. So we need a flag in the IPI domain which tells us whether that
> allocation needs to be weight(desc) or 1.

OK. But is it bad to always allocate the weight? I thought allocating 
virqs is cheap, or maybe not?

Thanks,
Qais
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Thread

[PATCH 07/14] genirq: Add a new generic IPI reservation code to irq core Qais Yousef <qais.yousef@imgtec.com> - 2015-11-03 12:20 +0100
  Re: [PATCH 07/14] genirq: Add a new generic IPI reservation code to  irq core kbuild test robot <lkp@intel.com> - 2015-11-03 13:10 +0100
  Re: [PATCH 07/14] genirq: Add a new generic IPI reservation code to  irq core Thomas Gleixner <tglx@linutronix.de> - 2015-11-07 13:20 +0100
  Re: [PATCH 07/14] genirq: Add a new generic IPI reservation code to  irq core Thomas Gleixner <tglx@linutronix.de> - 2015-11-07 14:40 +0100
    Re: [PATCH 07/14] genirq: Add a new generic IPI reservation code to  irq core Qais Yousef <qais.yousef@imgtec.com> - 2015-11-09 11:20 +0100

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