On Tue, 26 Oct 2021 12:23:09 -0700
Guenter Roeck [off-list ref] wrote:

On Fri, Oct 08, 2021 at 11:13:36AM +0200, Jiri Olsa wrote:

quoted

Adding simple module that uses multi direct interface:

  register_ftrace_direct_multi
  unregister_ftrace_direct_multi

The init function registers trampoline for 2 functions,
and exit function unregisters them.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>  

Building s390:defconfig ... failed
--------------
Error log:
<stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
{standard input}: Assembler messages:
{standard input}:11: Error: Unrecognized opcode: `pushq'
{standard input}:12: Error: Unrecognized opcode: `movq'
{standard input}:13: Error: Unrecognized opcode: `pushq'
{standard input}:14: Error: Unrecognized opcode: `movq'
{standard input}:15: Error: Unrecognized opcode: `call'
{standard input}:16: Error: Unrecognized opcode: `popq'
{standard input}:17: Error: Unrecognized opcode: `leave'
{standard input}:18: Error: Unrecognized opcode: `ret'
make[3]: *** [scripts/Makefile.build:288: samples/ftrace/ftrace-direct-multi.o] Error 1
make[2]: *** [scripts/Makefile.build:571: samples/ftrace] Error 2
make[1]: *** [Makefile:1993: samples] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:226: __sub-make] Error 2

  https://lore.kernel.org/all/YXAqZ%2FEszRisunQw@osiris/ (local)

-- Steve