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LoongArch: Get frame info in unwind_start() when regs is not available
[ Upstream commit 429a967 ] At unwind_start(), it is better to get its frame info here rather than get them outside, even we don't have 'regs'. In this way we can simply use unwind_{start, next_frame, done} outside. Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Sasha Levin <sashal@kernel.org>
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