[PATCH 02/25] perf tools: Introduce xyarray__zero function

[Jiri Olsa]

To zero all the xyarray contents. It will be used
in following patches.

Link: http://lkml.kernel.org/n/tip-bp8bcl46cav05xn0uacg7...@git.kernel.org
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/util/xyarray.c | 8 ++++++++
 tools/perf/util/xyarray.h | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/tools/perf/util/xyarray.c b/tools/perf/util/xyarray.c
index 22afbf6c536a..d0ca9ed5e7f2 100644
--- a/tools/perf/util/xyarray.c
+++ b/tools/perf/util/xyarray.c
@@ -9,11 +9,19 @@ struct xyarray *xyarray__new(int xlen, int ylen, size_t 
entry_size)
        if (xy != NULL) {
                xy->entry_size = entry_size;
                xy->row_size   = row_size;
+               xy->entries    = xlen * ylen;
        }
 
        return xy;
 }
 
+void xyarray__zero(struct xyarray *xy)
+{
+       size_t n = xy->entries * xy->entry_size;
+
+       memset(xy->contents, 0, n);
+}
+
 void xyarray__delete(struct xyarray *xy)
 {
        free(xy);
diff --git a/tools/perf/util/xyarray.h b/tools/perf/util/xyarray.h
index c488a07275dd..60cd80acdaa9 100644
--- a/tools/perf/util/xyarray.h
+++ b/tools/perf/util/xyarray.h
@@ -6,11 +6,13 @@
 struct xyarray {
        size_t row_size;
        size_t entry_size;
+       size_t entries;
        char contents[];
 };
 
 struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size);
 void xyarray__delete(struct xyarray *xy);
+void xyarray__zero(struct xyarray *xy);
 
 static inline void *xyarray__entry(struct xyarray *xy, int x, int y)
 {
-- 
1.9.3

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