linux-kernel - Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this

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Date:	Tue, 22 Sep 2015 20:54:19 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yang Yingliang <yangyingliang@...wei.com>
cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Rutland <mark.rutland@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu()
 for cpu hotplug

On Sat, 19 Sep 2015, Yang Yingliang wrote:

> Add irq_migrate_all_off_this_cpu() into kernel/irq/migration.c.

This doesn't make any sense at all. 

You just reuse the existing file to stick your new code into it
without reusing a single bit in that file. Aside of that it's
unconditionally compiled, which means all existing users of
CONFIG_GENERIC_PENDING_IRQ are burdened with pointless code.

The right thing to do is:

Add that code to a new file: kernel/irq/cpuhotplug.c and make that
depend on CONFIG_GENERIC_IRQ_MIGRATION.

Thanks,

	tglx

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