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libperf: Add perf_cpu_map__refcnt() interanl accessor to use in the m…
…aps test To remove one more direct access to 'struct perf_cpu_map' so that we can intercept accesses to its instantiations and refcount check it to catch use after free, etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Riccardo Mancini <rickyman7@gmail.com> Cc: Stephane Eranian <eranian@google.com> Cc: Stephen Brennan <stephen.s.brennan@oracle.com> Link: https://lore.kernel.org/lkml/ZD1qdYjG+DL6KOfP@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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