On Thu, Oct 14, 2021 at 09:58:39PM -0500, madvenka@xxxxxxxxxxxxxxxxxxx wrote: > From: "Madhavan T. Venkataraman" <madvenka@xxxxxxxxxxxxxxxxxxx> > > Currently, get_wchan() in ARM64 code walks the stack using start_backtrace() > and unwind_frame(). Make it use arch_stack_walk() instead. This makes > maintenance easier. This overlaps with some very similar updates that Peter Zijlstra is working on which addresses some existing problems with wchan: https://lore.kernel.org/all/20211008111527.438276127@xxxxxxxxxxxxx/ It probably makes sense for you to coordinate with Peter here, some of that series is already merged up to his patch 6 which looks very similar to what you've got here. In that thread you'll see that Mark Rutland spotted an issue with the handling of __switch_to() on arm64 which probably also applies to your change.
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