linux-kernel - Re: [PATCH v2 01/26] genirq: add irq

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Message-ID: <20140901152248.GA30405@n2100.arm.linux.org.uk>
Date:	Mon, 1 Sep 2014 16:22:48 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
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	Catalin Marinas <Catalin.Marinas@....com>,
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	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
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	Vladimir Murzin <Vladimir.Murzin@....com>
Subject: Re: [PATCH v2 01/26] genirq: add irq_domain-aware core IRQ handler

On Tue, Aug 26, 2014 at 11:46:38AM -0700, Stephen Boyd wrote:
> Ah ok. This is the multi-irq handler case? Has this been broken since
> v3.2 at least for the gic users? Now that we call irq_enter()/irq_exit()
> a lot more code runs, including things like updating jiffies when
> interrupts arrive and invoking softirq? Do we only call irq_exit() on
> the IPI path otherwise?
> 
> Are there any plans to send this back to stable trees? Not calling
> irq_enter()/irq_exit() when we get an interrupt seems like a big problem.

gic_handle_irq() calls handle_IRQ() which has the irq_enter()..irq_exit()
wrappers.

If we didn't have irq_exit(), then softirq's would be totally broken on
all gic-based platforms.

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