Messages in this thread | | | Date | Thu, 3 Dec 2020 14:03:20 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 2/6] genirq: Allow an interrupt to be marked as 'raw' |
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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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