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Date: Thu, 3 Dec 2020 14:03:20 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Valentin Schneider <valentin.schneider@....com> Cc: Marc Zyngier <maz@...nel.org>, LAK <linux-arm-kernel@...ts.infradead.org>, linux-kernel <linux-kernel@...r.kernel.org>, Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Thomas Gleixner <tglx@...utronix.de>, Mark Rutland <mark.rutland@....com>, Russell King <linux@....linux.org.uk>, Android Kernel Team <kernel-team@...roid.com> Subject: Re: [PATCH v2 2/6] genirq: Allow an interrupt to be marked as 'raw' On Thu, Nov 26, 2020 at 06:18:33PM +0000, Valentin Schneider wrote: > If I got the RCU bits right from what Thomas mentioned in > > https://lore.kernel.org/r/87ft5q18qs.fsf@nanos.tec.linutronix.de > https://lore.kernel.org/r/87lfewnmdz.fsf@nanos.tec.linutronix.de > > then we're still missing something to notify RCU in the case the IRQ hits > the idle task. All I see on our entry path is > > trace_hardirqs_off(); > ... > irq_handler() > handle_domain_irq(); > ... > trace_hardirqs_on(); > > so we do currently rely on handle_domain_irq()'s irq_enter() + irq_exit() > for that. rcu_irq_enter() says CONFIG_RCU_EQS_DEBUG=y can detect missing > bits, but I don't get any warnings with your series on my Juno. The scheduler IPI really doesn't need RCU either ;-)
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