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

Signed-off-by: Marc Zyngier <m...@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

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