[PATCH v3 1/7] riscv: ftrace: support fastcc in Clang for WITH_ARGS

[Björn Töpel]

Andy Chiu <andybnac at gmail.com> writes:

> From: Andy Chiu <andy.chiu at sifive.com>
>
> 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 <e.shatokhin at yadro.com>
> Closes: https://lore.kernel.org/linux-riscv/7e7c7914-445d-426d-89a0-59a9199c45b1@yadro.com/
> Acked-by: Nathan Chancellor <nathan at kernel.org>
> Signed-off-by: Andy Chiu <andy.chiu at sifive.com>

Fixes tag?

Reviewed-by: Björn Töpel <bjorn at rivosinc.com>