Messages in this thread |  | | Date | Wed, 12 Aug 2020 12:35:30 +0200 | From | peterz@infradea ... | Subject | Re: [PATCH 1/2] lockdep: improve current->(hard|soft)irqs_enabled synchronisation with actual irq state |
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On Wed, Aug 12, 2020 at 06:18:28PM +1000, Nicholas Piggin wrote: > Excerpts from peterz@infradead.org's message of August 7, 2020 9:11 pm: > > > > What's wrong with something like this? > > > > AFAICT there's no reason to actually try and add IRQ tracing here, it's > > just a hand full of instructions at the most. > > Because we may want to use that in other places as well, so it would > be nice to have tracing. > > Hmm... also, I thought NMI context was free to call local_irq_save/restore > anyway so the bug would still be there in those cases?
NMI code has in_nmi() true, in which case the IRQ tracing is disabled (except for x86 which has CONFIG_TRACE_IRQFLAGS_NMI).
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