If there are no values in bpf_prog_info or bpf_btf feature don't write the data into the header. Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx> --- tools/perf/util/header.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 69e4f6aae293..6657b02d4a81 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -1016,10 +1016,13 @@ static int write_bpf_prog_info(struct feat_fd *ff, struct perf_env *env = &ff->ph->env; struct rb_root *root; struct rb_node *next; - int ret; + int ret = 0; down_read(&env->bpf_progs.lock); + if (env->bpf_progs.infos_cnt == 0) + goto out; + ret = do_write(ff, &env->bpf_progs.infos_cnt, sizeof(env->bpf_progs.infos_cnt)); if (ret < 0) @@ -1058,10 +1061,13 @@ static int write_bpf_btf(struct feat_fd *ff, struct perf_env *env = &ff->ph->env; struct rb_root *root; struct rb_node *next; - int ret; + int ret = 0; down_read(&env->bpf_progs.lock); + if (env->bpf_progs.btfs_cnt == 0) + goto out; + ret = do_write(ff, &env->bpf_progs.btfs_cnt, sizeof(env->bpf_progs.btfs_cnt)); -- 2.50.0.rc0.604.gd4ff7b7c86-goog
