From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3.17-rc4 v7 4/6] irqchip: gic: Add support for IPI FIQ
Date: Thu, 18 Sep 2014 09:17:39 +0100 [thread overview]
Message-ID: <20140918081739.GA5182@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1410970218-28847-5-git-send-email-daniel.thompson@linaro.org>
On Wed, Sep 17, 2014 at 09:10:16AM -0700, Daniel Thompson wrote:
> @@ -604,8 +731,19 @@ static void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
> {
> int cpu;
> unsigned long flags, map = 0;
> + unsigned long softint;
>
> - raw_spin_lock_irqsave(&irq_controller_lock, flags);
> + /*
> + * The locking in this function ensures we don't use stale cpu mappings
> + * and thus we never route an IPI to the wrong physical core during a
> + * big.LITTLE switch. The switch code takes both of these locks meaning
> + * we can choose whichever lock is safe to use from our current calling
> + * context.
> + */
> + if (in_nmi())
> + raw_spin_lock(&fiq_safe_migration_lock);
> + else
> + raw_spin_lock_irqsave(&irq_controller_lock, flags);
BTW, I see this code is still here...
--
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2014-09-18 8:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-17 16:10 [PATCH 3.17-rc4 v7 0/6] arm: Implement arch_trigger_all_cpu_backtrace Daniel Thompson
2014-09-17 16:10 ` [PATCH 3.17-rc4 v7 1/6] ARM: remove unused do_unexp_fiq() function Daniel Thompson
2014-09-17 16:10 ` [PATCH 3.17-rc4 v7 2/6] arm: fiq: Replace default FIQ handler Daniel Thompson
2014-09-17 16:10 ` [PATCH 3.17-rc4 v7 3/6] arm64: Introduce dummy version of asm/fiq.h Daniel Thompson
2014-09-22 9:16 ` Catalin Marinas
2014-09-17 16:10 ` [PATCH 3.17-rc4 v7 4/6] irqchip: gic: Add support for IPI FIQ Daniel Thompson
2014-09-17 18:51 ` Russell King - ARM Linux
2014-09-17 20:12 ` Daniel Thompson
2014-09-17 21:07 ` Russell King - ARM Linux
2014-09-18 7:48 ` Russell King - ARM Linux
2014-09-18 21:46 ` Marc Zyngier
2014-09-18 8:17 ` Russell King - ARM Linux [this message]
2014-09-18 21:20 ` Daniel Thompson
2014-09-17 16:10 ` [PATCH 3.17-rc4 v7 5/6] ARM: add basic support for on-demand backtrace of other CPUs Daniel Thompson
2014-09-17 16:10 ` [PATCH 3.17-rc4 v7 6/6] arm: smp: Handle ipi_cpu_backtrace() using FIQ (if available) Daniel Thompson
2014-10-14 22:37 ` [PATCH 3.17-rc4 v7 0/6] arm: Implement arch_trigger_all_cpu_backtrace Daniel Drake
2014-10-14 23:31 ` Russell King - ARM Linux
2014-10-16 9:33 ` Daniel Thompson
2014-11-04 17:05 ` Daniel Thompson
2014-11-04 17:19 ` Russell King - ARM Linux
2014-10-16 9:23 ` Daniel Thompson
2014-10-16 12:23 ` Russell King - ARM Linux
2014-10-16 13:15 ` Daniel Thompson
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