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arm64: Make all stack walking functions use arch_stack_walk()
Currently, there are multiple functions in ARM64 code that walk the stack using start_backtrace() and unwind_frame(). Convert all of them to use arch_stack_walk(). This makes maintenance easier. Here is the list of functions: perf_callchain_kernel() get_wchan() return_address() dump_backtrace() profile_pc() Signed-off-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com>
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