From 42f775df7290a84151220f3e705f7bc2c27027eb Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 20 Oct 2020 15:37:04 +0100 Subject: [PATCH] FROMLIST: 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 --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/smp.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a7c07ae524d9..cf21e80963b5 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -111,6 +111,7 @@ config ARM64 select GENERIC_EARLY_IOREMAP select GENERIC_IDLE_POLL_SETUP select GENERIC_IRQ_IPI + select ARCH_WANTS_IRQ_RAW select GENERIC_IRQ_MULTI_HANDLER select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 3e42884f1591..22c65fbbf4c5 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -1005,6 +1005,10 @@ 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;