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unwind_init() is currently a single function that initializes all of the unwind state. Split it into the following functions and call them appropriately: - unwind_init_from_regs() - initialize from regs passed by caller. - unwind_init_from_caller() - initialize for the current task from the caller of arch_stack_walk(). - unwind_init_from_task() - initialize from the saved state of a task other than the current task. In this case, the other task must not be running. This is done for two reasons: - the different ways of initializing are clear - specialized code can be added to each initializer in the future. Signed-off-by: Madhavan T. Venkataraman <madvenka@linux.microsoft.com> Reviewed-by: Mark Brown <broonie@kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20220617180219.20352-2-madvenka@linux.microsoft.com Signed-off-by: Will Deacon <will@kernel.org>