From b1d7d73520f86d37492e348a32fbc91d3aa99121 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 20 Oct 2020 15:37:04 +0100 Subject: [PATCH] ANDROID: arm64: Mark the recheduling IPI as raw interrupt Flag the rescheduling IPI as 'raw', making sure such interrupt skips both tick management and irqtime accounting. Bug: 191808738 Link: https://lore.kernel.org/lkml/20201124141449.572446-4-maz@kernel.org/ Change-Id: Ibeda817de7618a98d457d09a6fa7e54f867b72f0 Signed-off-by: Marc Zyngier [minor port to 5.10] Signed-off-by: Stephen Dickey [use irq_set_status_flags instead of __irq_modify_status] Signed-off-by: Stephen Dickey --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/smp.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 50538e1b2eb7..33c722fbc22a 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -125,6 +125,7 @@ config ARM64 select GENERIC_FIND_FIRST_BIT select GENERIC_IDLE_POLL_SETUP select GENERIC_IRQ_IPI + select ARCH_WANTS_IRQ_RAW select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW_LEVEL diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 42fb5ae54218..592346f5b6c2 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -1000,7 +1000,12 @@ void __init set_smp_ipi_range(int ipi_base, int n) WARN_ON(err); ipi_desc[i] = irq_to_desc(ipi_base + i); - irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); + + if (i != IPI_RESCHEDULE) + irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); + else + /* The recheduling IPI is special... */ + irq_set_status_flags(ipi_base + i, IRQ_HIDDEN|IRQ_RAW); } ipi_irq_base = ipi_base;