perf tools: Introduce opt_event_config nonterminal
To remove duplicated code that differs only in using the matching '/a,b,c/' part or NULL if no event configuration is done ('//' or no pair of slashes at all). Will be used by some new targets allowing the configuration of hardware events, etc. Lifted part of the 'opt_event_config' nonterminal from a patch by Wang Nan. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Cody P Schafer <dev@codyps.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jeremie Galarneau <jeremie.galarneau@efficios.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kirill Smelkov <kirr@nexedi.com> Cc: Li Zefan <lizefan@huawei.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/n/tip-e3xzpx9cqsmwnaguaxyw6r42@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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