From: Ian Rogers <irogers@xxxxxxxxxx> Use realloc() rather than malloc()+memcpy() to possibly avoid a memory allocation when appending array elements. Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Alexei Starovoitov <ast@xxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx> Cc: Jin Yao <yao.jin@xxxxxxxxxxxxxxx> Cc: John Garry <john.garry@xxxxxxxxxx> Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Martin KaFai Lau <kafai@xxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Song Liu <songliubraving@xxxxxx> Cc: Stephane Eranian <eranian@xxxxxxxxxx> Cc: Yonghong Song <yhs@xxxxxx> Cc: bpf@xxxxxxxxxxxxxxx Cc: clang-built-linux@xxxxxxxxxxxxxxxx Cc: netdev@xxxxxxxxxxxxxxx Link: http://lore.kernel.org/lkml/20191023005337.196160-6-irogers@xxxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> --- tools/perf/util/parse-events.y | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 5863acb34780..ffa1a1b63796 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -689,14 +689,12 @@ array_terms ',' array_term struct parse_events_array new_array; new_array.nr_ranges = $1.nr_ranges + $3.nr_ranges; - new_array.ranges = malloc(sizeof(new_array.ranges[0]) * - new_array.nr_ranges); + new_array.ranges = realloc($1.ranges, + sizeof(new_array.ranges[0]) * + new_array.nr_ranges); ABORT_ON(!new_array.ranges); - memcpy(&new_array.ranges[0], $1.ranges, - $1.nr_ranges * sizeof(new_array.ranges[0])); memcpy(&new_array.ranges[$1.nr_ranges], $3.ranges, $3.nr_ranges * sizeof(new_array.ranges[0])); - free($1.ranges); free($3.ranges); $$ = new_array; } -- 2.21.0
