Commit 64441a7b authored by Guo Ren's avatar Guo Ren Committed by Greg Kroah-Hartman
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csky: Set regs->usp to kernel sp, when the exception is from kernel 



[ Upstream commit f8e17c17 ]

In the past, we didn't care about kernel sp when saving pt_reg. But in some
cases, we still need pt_reg->usp to represent the kernel stack before enter
exception.

For cmpxhg in atomic.S, we need save and restore usp for above.

Signed-off-by: default avatarGuo Ren <guoren@linux.alibaba.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent fc55e0de
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