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

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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@google.com>
Link: https://lore.kernel.org/r/20250617223356.2752099-4-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers
2025-06-06 23:12:38 -07:00
committed by Namhyung Kim
parent 4d2eefd7fb
commit f0d0f978f3
1 changed files with 8 additions and 2 deletions
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10
tools/perf/util/header.c
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@@ -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));