On 2021-08-04 10:57:11 [-0600], Jens Axboe wrote: > > The spin_lock_irq() vs local_irq_disable() + spin_lock() is documented > > in Documentation/locking/locktypes.rst. > > That said I have no problem by carrying that patch in the RT-patchset > > and revisit it later. > > Right, I suspect that was added as a pre RT patch dump at some point. > It's a newer thing. Is it actually possible to set PREEMPT_RT in the > mainline kernel? Looks like it depends on ARCH_SUPPORTS_RT and nobody > sets that. Yes. It is upstream now. The documentation and CONFIG_PREEMPT_RT symbol. The Kconfig symbol has already users outside of the -RT patch. You can't enable it yet since we require a few things which are on their way. Having the symbol and the documentation helped to convince some people :) > So I agree that just carrying your solution in the RT patchset is fine > for now, we can revisit later. Okay. Sebastian
