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SubjectRe: [for-linus][PATCH 5/5] ftrace/samples: Add module to test multi direct modify interface
On Thu, Dec 09, 2021 at 10:29:13AM -0500, Steven Rostedt wrote:
> From: Jiri Olsa <jolsa@redhat.com>
>
> Adding ftrace-direct-multi-modify.ko kernel module that uses
> modify_ftrace_direct_multi API. The core functionality is taken
> from ftrace-direct-modify.ko kernel module and changed to fit
> multi direct interface.
>
> The init function creates kthread that periodically calls
> modify_ftrace_direct_multi to change the trampoline address
> for the direct ftrace_ops. The ftrace trace_pipe then shows
> trace from both trampolines.
>
> Link: https://lkml.kernel.org/r/20211206182032.87248-4-jolsa@kernel.org
>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Heiko Carstens <hca@linux.ibm.com>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> ---
> samples/ftrace/Makefile | 1 +
> samples/ftrace/ftrace-direct-multi-modify.c | 152 ++++++++++++++++++++
> 2 files changed, 153 insertions(+)
> create mode 100644 samples/ftrace/ftrace-direct-multi-modify.c

FWIW, for the s390 bits in here:

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Heiko Carstens <hca@linux.ibm.com>

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