Commit f0d0f978 authored by Ian Rogers's avatar Ian Rogers Committed by Namhyung Kim
Browse files

perf header: Don't write empty BPF/BTF info 



If there are no values in bpf_prog_info or bpf_btf feature don't write
the data into the header.

Signed-off-by: default avatarIan Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250617223356.2752099-4-irogers@google.com


Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
parent 4d2eefd7

tools/perf/util/header.c

+8 −2
Original line number Diff line number Diff line
@@ -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));