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FROMLIST: arm64: Mark the recheduling IPI as raw interrupt

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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 <maz@kernel.org>
[minor port to 5.10]
Signed-off-by: Stephen Dickey <dickey@codeaurora.org>
This commit is contained in:
Marc Zyngier
2020-10-20 15:37:04 +01:00
committed by Todd Kjos
parent 3f9d45d802
commit 42f775df72
2 changed files with 5 additions and 0 deletions
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1
arch/arm64/Kconfig
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@@ -111,6 +111,7 @@ config ARM64
select GENERIC_EARLY_IOREMAP select GENERIC_EARLY_IOREMAP
select GENERIC_IDLE_POLL_SETUP select GENERIC_IDLE_POLL_SETUP
select GENERIC_IRQ_IPI select GENERIC_IRQ_IPI
select ARCH_WANTS_IRQ_RAW
select GENERIC_IRQ_MULTI_HANDLER select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_IRQ_PROBE select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW

4
arch/arm64/kernel/smp.c
View File

@@ -1005,6 +1005,10 @@ void __init set_smp_ipi_range(int ipi_base, int n)
ipi_desc[i] = irq_to_desc(ipi_base + i); ipi_desc[i] = irq_to_desc(ipi_base + i);
irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); 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; ipi_irq_base = ipi_base;