linux/arch/loongarch/Kconfig.debug

config UNWINDER_GUESS
	bool "Guess unwinder"
	help
	  This option enables the "guess" unwinder for unwinding kernel stack
	  traces.  It scans the stack and reports every kernel text address it
	  finds.  Some of the addresses it reports may be incorrect.

	  While this option often produces false positives, it can still be
	  useful in many cases.
LoongArch: Add guess unwinder support Name "guess unwinder" comes from x86, it scans the stack and reports every kernel text address it finds. Unwinders can be used by dump_stack() and other stacktrace functions. Three stages when we do unwind, 1) unwind_start(), the prapare of unwinding, fill unwind_state. 2) unwind_done(), judge whether the unwind process is finished or not. 3) unwind_next_frame(), unwind the next frame. Add get_stack_info() to get stack info. At present we have irq stack and task stack. The next_sp is the key info between two types of stacks. Dividing unwinder helps to add new unwinders in the future. Signed-off-by: Qing Zhang <zhangqing@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 2022-08-06 08:10:02 +00:00			`config UNWINDER_GUESS`
			`bool "Guess unwinder"`
			`help`
			`This option enables the "guess" unwinder for unwinding kernel stack`
			`traces. It scans the stack and reports every kernel text address it`
			`finds. Some of the addresses it reports may be incorrect.`

			`While this option often produces false positives, it can still be`
			`useful in many cases.`