[PATCH v2 0/3] ftrace: Add sample code with dynamic ftrace_ops

[Mark Rutland <mark.rutland@arm.com>]

This series adds sample code to manipulate dynamic ftrace_ops, which
I've been using to benchmark/test some changes I've been making in this
area for arm64.

In the process of writing that I spotted a couple of minor issues,
addressed by the first two patches.

I'm not sure whether this should be a sample or something under lib/;
I'm happy to change that if folk have strong opinions.

Since v1 [1]:
* Rebase to v6.2-rc2 (trivial)
* Fix typos
* Fix commit title style
* Apply Steve's Reviewed-by to patch 2
* Fix "save_regs" module parameter name
* Add example output from sample module

[1] https://lore.kernel.org/lkml/20221103170907.931465-1-mark.rutland@arm.com/

Thanks,
Mark.

Mark Rutland (3):
  ftrace: Maintain samples/ftrace
  ftrace: Export ftrace_free_filter() to modules
  ftrace: Add sample with custom ops

 MAINTAINERS                                 |   1 +
 kernel/trace/ftrace.c                       |  23 +-
 samples/Kconfig                             |   7 +
 samples/Makefile                            |   1 +
 samples/ftrace/Makefile                     |   1 +
 samples/ftrace/ftrace-direct-multi-modify.c |   1 +
 samples/ftrace/ftrace-direct-multi.c        |   1 +
 samples/ftrace/ftrace-ops.c                 | 252 ++++++++++++++++++++
 8 files changed, 286 insertions(+), 1 deletion(-)
 create mode 100644 samples/ftrace/ftrace-ops.c

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2.30.2