libperf: Add perf_cpu_map struct

Add perf_cpu_map struct to libperf.

It's added as a declaration into:

  include/perf/cpumap.h

which will be included by users.

The perf_cpu_map struct definition is added into:

  include/internal/cpumap.h

which is not to be included by users, but shared within perf and
libperf.

We tried the total separation of the perf_cpu_map struct in libperf, but
it lead to complications and much bigger changes in perf code, so we
decided to share the declaration.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-29-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/Build

 libperf-y += core.o
+libperf-y += cpumap.o

tools/perf/lib/cpumap.c

+// SPDX-License-Identifier: GPL-2.0-only
+#include <perf/cpumap.h>
+#include <stdlib.h>
+#include <linux/refcount.h>
+#include <internal/cpumap.h>

tools/perf/lib/include/internal/cpumap.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_INTERNAL_CPUMAP_H
+#define __LIBPERF_INTERNAL_CPUMAP_H
+
+#include <linux/refcount.h>
+
+struct perf_cpu_map {
+	refcount_t	refcnt;
+	int		nr;
+	int		map[];
+};
+
+#endif /* __LIBPERF_INTERNAL_CPUMAP_H */

tools/perf/lib/include/perf/cpumap.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_CPUMAP_H
+#define __LIBPERF_CPUMAP_H
+
+struct perf_cpu_map;
+
+#endif /* __LIBPERF_CPUMAP_H */

tools/perf/util/cpumap.h

@@ -5,16 +5,11 @@
 #include <stdio.h>
 #include <stdbool.h>
 #include <linux/refcount.h>
+#include <internal/cpumap.h>
 
 #include "perf.h"
 #include "util/debug.h"
 
-struct perf_cpu_map {
-	refcount_t refcnt;
-	int nr;
-	int map[];
-};
-
 struct perf_cpu_map *cpu_map__new(const char *cpu_list);
 struct perf_cpu_map *cpu_map__empty_new(int nr);
 struct perf_cpu_map *cpu_map__dummy_new(void);