[PATCH 42/69] libperf: Add perf_mmap__init() function

[Arnaldo Carvalho de Melo]

From: Jiri Olsa <jolsa@xxxxxxxxxx>

Add perf_mmap__init() function to initialize 'struct perf_mmap' objects.

Add it to a new mmap.c source file, that will carry all the mmap related
functions.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Michael Petlan <mpetlan@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20191007125344.14268-2-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/lib/Build                   | 1 +
 tools/perf/lib/include/internal/mmap.h | 2 ++
 tools/perf/lib/mmap.c                  | 9 +++++++++
 tools/perf/util/evlist.c               | 5 ++---
 4 files changed, 14 insertions(+), 3 deletions(-)
 create mode 100644 tools/perf/lib/mmap.c

diff --git a/tools/perf/lib/Build b/tools/perf/lib/Build
index c31f1c111f8f..2ef9a4ec6d99 100644
--- a/tools/perf/lib/Build
+++ b/tools/perf/lib/Build
@@ -3,6 +3,7 @@ libperf-y += cpumap.o
 libperf-y += threadmap.o
 libperf-y += evsel.o
 libperf-y += evlist.o
+libperf-y += mmap.o
 libperf-y += zalloc.o
 libperf-y += xyarray.o
 libperf-y += lib.o
diff --git a/tools/perf/lib/include/internal/mmap.h b/tools/perf/lib/include/internal/mmap.h
index ba1e519c15b9..e25890de6a55 100644
--- a/tools/perf/lib/include/internal/mmap.h
+++ b/tools/perf/lib/include/internal/mmap.h
@@ -29,4 +29,6 @@ struct perf_mmap {
 	char		 event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
 };
 
+void perf_mmap__init(struct perf_mmap *map, bool overwrite);
+
 #endif /* __LIBPERF_INTERNAL_MMAP_H */
diff --git a/tools/perf/lib/mmap.c b/tools/perf/lib/mmap.c
new file mode 100644
index 000000000000..3da6177510e6
--- /dev/null
+++ b/tools/perf/lib/mmap.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <internal/mmap.h>
+
+void perf_mmap__init(struct perf_mmap *map, bool overwrite)
+{
+	map->fd = -1;
+	map->overwrite = overwrite;
+	refcount_set(&map->refcnt, 0);
+}
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index e33b46aca5cb..6c8de0865670 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -629,8 +629,6 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 		return NULL;
 
 	for (i = 0; i < evlist->core.nr_mmaps; i++) {
-		map[i].core.fd = -1;
-		map[i].core.overwrite = overwrite;
 		/*
 		 * When the perf_mmap() call is made we grab one refcount, plus
 		 * one extra to let perf_mmap__consume() get the last
@@ -640,8 +638,9 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist,
 		 * Each PERF_EVENT_IOC_SET_OUTPUT points to this mmap and
 		 * thus does perf_mmap__get() on it.
 		 */
-		refcount_set(&map[i].core.refcnt, 0);
+		perf_mmap__init(&map[i].core, overwrite);
 	}
+
 	return map;
 }
 
-- 
2.21.0