Mark Rutland 8be9fbd534 ftrace: Export ftrace_free_filter() to modules ... Setting filters on an ftrace ops results in some memory being allocated for the filter hashes, which must be freed before the ops can be freed. This can be done by removing every individual element of the hash by calling ftrace_set_filter_ip() or ftrace_set_filter_ips() with `remove` set, but this is somewhat error prone as it's easy to forget to remove an element. Make it easier to clean this up by exporting ftrace_free_filter(), which can be used to clean up all of the filter hashes after an ftrace_ops has been unregistered. Using this, fix the ftrace-direct* samples to free hashes prior to being unloaded. All other code either removes individual filters explicitly or is built-in and already calls ftrace_free_filter(). Link: https://lkml.kernel.org/r/20230103124912.2948963-3-mark.rutland@arm.com Cc: stable@vger.kernel.org Cc: Florent Revest <revest@chromium.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Fixes: e1067a07cf ("ftrace/samples: Add module to test multi direct modify interface") Fixes: 5fae941b9a ("ftrace/samples: Add multi direct interface test module") Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>		2023-01-24 11:20:58 -05:00
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ftrace-direct-modify.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
ftrace-direct-multi-modify.c	ftrace: Export ftrace_free_filter() to modules	2023-01-24 11:20:58 -05:00
ftrace-direct-multi.c	ftrace: Export ftrace_free_filter() to modules	2023-01-24 11:20:58 -05:00
ftrace-direct-too.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
ftrace-direct.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
Makefile	ftrace/samples: Add module to test multi direct modify interface	2021-12-09 13:02:44 -05:00
sample-trace-array.c	sample-trace-array: Remove trace_array 'sample-instance'	2020-06-16 21:21:02 -04:00
sample-trace-array.h	tracing: Sample module to demonstrate kernel access to Ftrace instances.	2019-11-22 19:41:08 -05:00