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-rw-r--r--tools/lib/bpf/btf.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 3d1c25fc97ae..bfef3d606b54 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -657,22 +657,32 @@ int btf__finalize_data(struct bpf_object *obj, struct btf *btf)
int btf__load(struct btf *btf)
{
- __u32 log_buf_size = BPF_LOG_BUF_SIZE;
+ __u32 log_buf_size = 0;
char *log_buf = NULL;
int err = 0;
if (btf->fd >= 0)
return -EEXIST;
- log_buf = malloc(log_buf_size);
- if (!log_buf)
- return -ENOMEM;
+retry_load:
+ if (log_buf_size) {
+ log_buf = malloc(log_buf_size);
+ if (!log_buf)
+ return -ENOMEM;
- *log_buf = 0;
+ *log_buf = 0;
+ }
btf->fd = bpf_load_btf(btf->data, btf->data_size,
log_buf, log_buf_size, false);
if (btf->fd < 0) {
+ if (!log_buf || errno == ENOSPC) {
+ log_buf_size = max((__u32)BPF_LOG_BUF_SIZE,
+ log_buf_size << 1);
+ free(log_buf);
+ goto retry_load;
+ }
+
err = -errno;
pr_warn("Error loading BTF: %s(%d)\n", strerror(errno), errno);
if (*log_buf)