| Date | Thu, 19 May 2022 16:48:21 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 03/21] rcu: Add a note about noinstr VS unsafe eqs functions |
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On Tue, May 03, 2022 at 12:00:33PM +0200, Frederic Weisbecker wrote: > Some RCU functions enter or exit into/from RCU idle mode while using > trace-able and lockdep-aware IRQs (un-)masking. This could be easily > solved with using raw versions of local_irq_*() but we would then > lose some precious debugging informations. > > Another possible way to solve this may consist in using rude RCU-tasks > in lockdep and irqsoff tracing. > > In any case and until this get solved, those RCU functions can't get > tagged as noinstr even though they should.
No need to speculate on how to solve it; the generic entry code has alternatives that are good. It's just that reworking your architecture isn't trivial.
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