Messages in this thread Patch in this message | | | From | Marc Zyngier <> | Subject | [PATCH v2 4/6] arm: Mark the recheduling IPI as raw interrupt | Date | Tue, 24 Nov 2020 14:14:47 +0000 |
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Flag the rescheduling IPI as 'raw', making sure such interrupt skips both tick management and irqtime accounting.
Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm/Kconfig | 1 + arch/arm/kernel/smp.c | 4 ++++ 2 files changed, 5 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fe2f17eb2b50..a5e3e9963ba4 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -50,6 +50,7 @@ config ARM select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_IRQ_IPI if SMP + select ARCH_WANTS_IRQ_RAW if GENERIC_IRQ_IPI select GENERIC_CPU_AUTOPROBE select GENERIC_EARLY_IOREMAP select GENERIC_IDLE_POLL_SETUP diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 48099c6e1e4a..0e09c8320caf 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -738,6 +738,10 @@ void __init set_smp_ipi_range(int ipi_base, int n) ipi_desc[i] = irq_to_desc(ipi_base + i); irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); + + /* The recheduling IPI is special... */ + if (i == IPI_RESCHEDULE) + __irq_modify_status(ipi_base + i, 0, IRQ_RAW, ~0); } ipi_irq_base = ipi_base; -- 2.28.0
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