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

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Message-ID: <alpine.DEB.2.11.1511071427370.4032@nanos>
Date:	Sat, 7 Nov 2015 14:31:42 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Qais Yousef <qais.yousef@...tec.com>
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 07/14] genirq: Add a new generic IPI reservation code to
 irq core

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.

Thanks,

	tglx


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