perf list: List callback support for libpfm
Missed previously, add libpfm support for 'perf list' callbacks and thereby JSON support. Committer notes: Add __maybe_unused to the args of the new print_libpfm_events() in the else HAVE_LIBPFM block. Fixes: e42b0ee61282a2f9 ("perf list: Add JSON output option") Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Caleb Biggers <caleb.biggers@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Perry Taylor <perry.taylor@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Rob Herring <robh@kernel.org> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Stephane Eranian <eranian@google.com> Cc: Weilin Wang <weilin.wang@intel.com> Cc: Xin Gao <gaoxin@cdjrlc.com> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Link: https://lore.kernel.org/r/20221118024607.409083-4-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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