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| author | Dietmar Eggemann <dietmar.eggemann@arm.com> | 2019-01-21 14:42:42 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-02-01 22:54:49 +0100 |
| commit | 1b5ba350784242eb1f899bcffd95d2c7cff61e84 (patch) | |
| tree | 3b865ce9272fd7da2368c081af4d852f662b6d7c /arch/arm/Kconfig | |
| parent | Linux 5.0-rc1 (diff) | |
| download | linux-1b5ba350784242eb1f899bcffd95d2c7cff61e84.tar.xz linux-1b5ba350784242eb1f899bcffd95d2c7cff61e84.zip | |
ARM: 8824/1: fix a migrating irq bug when hotplug cpu
Arm TC2 fails cpu hotplug stress test.
This issue was tracked down to a missing copy of the new affinity
cpumask for the vexpress-spc interrupt into struct
irq_common_data.affinity when the interrupt is migrated in
migrate_one_irq().
Fix it by replacing the arm specific hotplug cpu migration with the
generic irq code.
This is the counterpart implementation to commit 217d453d473c ("arm64:
fix a migrating irq bug when hotplug cpu").
Tested with cpu hotplug stress test on Arm TC2 (multi_v7_defconfig plus
CONFIG_ARM_BIG_LITTLE_CPUFREQ=y and CONFIG_ARM_VEXPRESS_SPC_CPUFREQ=y).
The vexpress-spc interrupt (irq=22) on this board is affine to CPU0.
Its affinity cpumask now changes correctly e.g. from 0 to 1-4 when
CPU0 is hotplugged out.
Suggested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 664e918e2624..26524b75970a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1400,6 +1400,7 @@ config NR_CPUS config HOTPLUG_CPU bool "Support for hot-pluggable CPUs" depends on SMP + select GENERIC_IRQ_MIGRATION help Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. |