[PATCH v2 3/6] arm64: Mark the recheduling IPI as raw interrupt

[Marc Zyngier]

Flag the rescheduling IPI as 'raw', making sure such interrupt
skips both tick management  and irqtime accounting.

Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 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 1515f6f153a0..d18c2c15848d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -108,6 +108,7 @@ 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 18e9727d3f64..bad51f7f7ffe 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -995,6 +995,10 @@ 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