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Message-ID: <20150704082623.GA7557@n2100.arm.linux.org.uk> Date: Sat, 4 Jul 2015 09:26:23 +0100 From: Russell King - ARM Linux <linux@....linux.org.uk> To: Jisheng Zhang <jszhang@...vell.com> Cc: tglx@...utronix.de, jason@...edaemon.net, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH v2 2/2] irqchip: dw-apb-ictl: add irq_set_affinity support On Sat, Jul 04, 2015 at 01:19:30PM +0800, Jisheng Zhang wrote: > On Marvell Berlin SoCs, the cpu's local timer is shutdown when the cpu > goes to a deep idle state, then the timer framework will be notified to > use a broadcast timer instead. The broadcast timer uses dw-apb-ictl as > interrupt chip, this patch adds irq_set_affinity support so that the > going to deep idle state cpu can set the interrupt affinity of the > broadcast interrupt to avoid unnecessary wakeups and IPIs. NAK to this patch. The real question is - if CPU0 is the CPU going offline, why is it still receiving _any_ interrupts - all interrupts should be migrated off it, including the chained interrupts. Sounds like there's a bug in the migration code which needs further investigation, rather than hacking around the problem by introducing lots of driver code. -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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