Masami Hiramatsu
8f7139ab2b
commit 0e2b81f7b52a1c1a8c46986f9ca01eb7b3c421f8 upstream. Rmove unneeded synth_event_mutex. This mutex protects the reference count in synth_event, however, those operational points are already protected by event_mutex. 1. In __create_synth_event() and create_or_delete_synth_event(), those synth_event_mutex clearly obtained right after event_mutex. 2. event_hist_trigger_func() is trigger_hist_cmd.func() which is called by trigger_process_regex(), which is a part of event_trigger_regex_write() and this function takes event_mutex. 3. hist_unreg_all() is trigger_hist_cmd.unreg_all() which is called by event_trigger_regex_open() and it takes event_mutex. 4. onmatch_destroy() and onmatch_create() have long call tree, but both are finally invoked from event_trigger_regex_write() and event_trace_del_tracer(), former takes event_mutex, and latter ensures called under event_mutex locked. Finally, I ensured there is no resource conflict. For safety, I added lockdep_assert_held(&event_mutex) for each function. Link: http://lkml.kernel.org/r/154140864134.17322.4796059721306031894.stgit@devbox Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com> Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: George Guo <guodongtai@kylinos.cn> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.