libperf: Adopt perf_mmap__read_init() from tools/perf
Move perf_mmap__read_init() from tools/perf to libperf and export it in
perf/mmap.h header.
And add pr_debug2()/pr_debug3() macros support, because the code is
using them.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20191007125344.14268-11-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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