Re: [PATCH v2 1/6] riscv: ftrace: support fastcc in Clang for WITH_ARGS

[Björn Töpel]

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

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