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Tue, 24 Nov 2020 14:14:56 +0000 From: Marc Zyngier To: LAK , linux-kernel Subject: [PATCH v2 4/6] arm: Mark the recheduling IPI as raw interrupt Date: Tue, 24 Nov 2020 14:14:47 +0000 Message-Id: <20201124141449.572446-5-maz@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201124141449.572446-1-maz@kernel.org> References: <20201124141449.572446-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, tglx@linutronix.de, Valentin.Schneider@arm.com, peterz@infradead.org, mark.rutland@arm.com, linux@arm.linux.org.uk, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201124_091459_361208_924514DB X-CRM114-Status: GOOD ( 16.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Android Kernel Team , Russell King , Peter Zijlstra , Catalin Marinas , Thomas Gleixner , Will Deacon , Valentin Schneider Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Flag the rescheduling IPI as 'raw', making sure such interrupt skips both tick management and irqtime accounting. Signed-off-by: Marc Zyngier --- arch/arm/Kconfig | 1 + arch/arm/kernel/smp.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fe2f17eb2b50..a5e3e9963ba4 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -50,6 +50,7 @@ config ARM select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI select GENERIC_CLOCKEVENTS_BROADCAST if SMP select GENERIC_IRQ_IPI if SMP + select ARCH_WANTS_IRQ_RAW if GENERIC_IRQ_IPI select GENERIC_CPU_AUTOPROBE select GENERIC_EARLY_IOREMAP select GENERIC_IDLE_POLL_SETUP diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 48099c6e1e4a..0e09c8320caf 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -738,6 +738,10 @@ 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel