Messages in this thread | | | From | Yang Yingliang <> | Subject | [RFC PATCH v2 0/3] arm/arm64: fix a migrating irq bug when hotplug cpu | Date | Mon, 14 Sep 2015 17:29:02 +0800 |
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Hi All,
There is a bug:
When cpu is disabled, all irqs will be migratged to another cpu. In some cases, a new affinity is different, it needed to be coppied to irq's affinity. But if the type of irq is LPI, it's affinity will not be coppied because of irq_set_affinity's return value.
As Marc and Will suggested, I refactor the arm/arm64 migrating interrupts code and fix the migrating irq bug while cpu is offline.
I'm trying let the core code do the migrating interrupts matter. kernel/irq/migration.c depends on CONFIG_GENERIC_PENDING_IRQ, so I make it selected by CONFIG_SMP and CONFIG_HOTPLUG_CPU and rename it to CONFIG_GENERIC_IRQ_MIGRATION for more general. When CONFIG_GENERIC_IRQ_MIGRATION is enabled, an interrupt whose state_use_accessors is not set with IRQD_MOVE_PCNTXT won't be migrated immediately in irq_set_affinity_locked(). So use irq_set_status_flags() helper to set the state in gic_irq_domain_map().
With the above preparation, move the migrating interrupts code into kernel/irq/migration.c and fix the bug by using irq_do_set_affinity().
Changes in v2: - use the exiting helper to set IRQD_MOVE_PCNTXT flag - use for_each_active_irq() instead of for_each_irq_desc() - add some warn messages when affinity is null or do set affinity failed
Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Yang Yingliang (3): irqchip: GICv3: set non-percpu irqs status with IRQ_MOVE_PCNTXT genirq: rename config GENERIC_PENDING_IRQ to GENERIC_IRQ_MIGRATION arm/arm64: fix a migrating irq bug when hotplug cpu
arch/arc/Kconfig | 2 +- arch/arm/Kconfig | 1 + arch/arm/include/asm/irq.h | 1 - arch/arm/kernel/irq.c | 62 --------------------------------------- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/irq.h | 1 - arch/arm64/kernel/irq.c | 62 --------------------------------------- arch/hexagon/Kconfig | 2 +- arch/ia64/Kconfig | 2 +- arch/tile/Kconfig | 2 +- arch/x86/Kconfig | 2 +- arch/x86/kernel/apic/io_apic.c | 2 +- drivers/irqchip/irq-gic-v3.c | 2 ++ include/linux/irq.h | 4 ++- include/linux/irqdesc.h | 2 +- kernel/irq/Kconfig | 4 +-- kernel/irq/Makefile | 2 +- kernel/irq/irqdesc.c | 6 ++-- kernel/irq/manage.c | 2 +- kernel/irq/migration.c | 66 ++++++++++++++++++++++++++++++++++++++++++ kernel/irq/proc.c | 2 +- 21 files changed, 88 insertions(+), 142 deletions(-)
-- 2.5.0
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