Andy Chiu [off-list ref] writes:

Some caller-saved registers which are not defined as function arguments
in the ABI can still be passed as arguments when the kernel is compiled
with Clang. As a result, we must save and restore those registers to
prevent ftrace from clobbering them.

- [1]: https://reviews.llvm.org/D68559

Reported-by: Evgenii Shatokhin <redacted>
Closes: https://lore.kernel.org/linux-riscv/7e7c7914-445d-426d-89a0-59a9199c45b1@yadro.com/ (local)
Acked-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Andy Chiu <redacted>

Shouldn't this be a separate fix? Still reading the details, but it
smells like something what should be disabled when building w/ LLVM, no?


Björn