So what *exactly* happened when it failed to work? The patch didn't apply? The kernel wouldn't compile? won't boot? Boots but no realtime? Any error messages?
What suggested that TRACE_IRQFLAGS would make a difference? Xenomai patching succeeded but when running one of is test apps, "latency" showing > > > > > > >> > 0"000.000| BUG in low_init(): [main] mlockall: Cannot allocate > > > > memory And the mailing list member suggested the following "The problematic option is CONFIG_TRACE_IRQFLAGS, not > > CONFIG_CONTEXT_TRACKING, and you have it enabled, since without it, > > you would not be able to enable CONFIG_LOCKDEP. Please disable > > CONFIG_TRACE_IRQFLAGS. You will need to disable all the options > > depending on that option, such as CONFIG_LOCKDEP." First thing to do is to verify that you *really* need the patch at all. 95% of people who think they need special real-time patches don't actually need them. Linux already has fairly good soft real-time support, which is good for most stuff. Experimenting for automation and for educational purposes.
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