Song Shuai [off-list ref] writes:

select HAVE_SAMPLE_FTRACE_DIRECT and HAVE_SAMPLE_FTRACE_DIRECT_MULTI
for ARCH_RV64I in arch/riscv/Kconfig. And add riscv asm code for
the ftrace-direct*.c files in samples/ftrace/.

Link: https://lore.kernel.org/linux-riscv/c68bac83-5c88-80b1-bac9-e1fd4ea8f07e@yadro.com/T/#ma13012560331c66b051b580b3ab4a04ba44455ec (local)
Tested-by: Evgenii Shatokhin <redacted>
Signed-off-by: Song Shuai <redacted>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>

My usual "please align op/operands" nit. ;-)

Acked-by: Björn Töpel <redacted>