From: Marc Zyngier <maz@kernel.org>
To: LAK <linux-arm-kernel@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Cc: Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Android Kernel Team <kernel-team@android.com>,
Valentin Schneider <Valentin.Schneider@arm.com>
Subject: [PATCH 2/2] arm64: Mark the recheduling IPI as naked interrupt
Date: Sun, 1 Nov 2020 13:14:30 +0000 [thread overview]
Message-ID: <20201101131430.257038-3-maz@kernel.org> (raw)
In-Reply-To: <20201101131430.257038-1-maz@kernel.org>
Flag the rescheduling IPI as 'naked', making sure such interrupt
doesn't trigger a rescheduling event by itself.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kernel/smp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 82e75fc2c903..6c11be3e74d3 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -993,6 +993,10 @@ 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_set_status_flags(ipi_base + i, IRQ_NAKED);
}
ipi_irq_base = ipi_base;
--
2.28.0
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next prev parent reply other threads:[~2020-11-01 13:18 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-01 13:14 [PATCH 0/2] arm64: Allow the rescheduling IPI to bypass irq_enter/exit Marc Zyngier
2020-11-01 13:14 ` [PATCH 1/2] genirq: Allow an interrupt to be marked as 'naked' Marc Zyngier
2020-11-01 14:33 ` David Laight
2020-11-01 13:14 ` Marc Zyngier [this message]
2020-11-01 14:30 ` [PATCH 0/2] arm64: Allow the rescheduling IPI to bypass irq_enter/exit David Laight
2020-11-02 10:30 ` Valentin Schneider
2020-11-10 13:03 ` Peter Zijlstra
[not found] ` <19286daf276f46aa@fake-msgid>
2020-11-10 15:48 ` Valentin Schneider
2020-11-03 20:32 ` Thomas Gleixner
2020-11-20 9:20 ` Marc Zyngier
2020-11-20 14:17 ` Thomas Gleixner
2020-11-22 16:13 ` Marc Zyngier
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