[PATCH RFC 2/5] bpf: Use file object build id in stackmap

[Jiri Olsa <jolsa@kernel.org>]

Use build id from file object in stackmap if it's available.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 kernel/bpf/stackmap.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index aecea7451b61..944cb260a42c 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -156,7 +156,15 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
 			goto build_id_valid;
 		}
 		vma = find_vma(current->mm, ips[i]);
+#ifdef CONFIG_FILE_BUILD_ID
+		if (vma && vma->vm_file && vma->vm_file->f_bid) {
+			memcpy(id_offs[i].build_id,
+			       vma->vm_file->f_bid->data,
+			       vma->vm_file->f_bid->sz);
+		} else {
+#else
 		if (!vma || build_id_parse(vma, id_offs[i].build_id, NULL)) {
+#endif
 			/* per entry fall back to ips */
 			id_offs[i].status = BPF_STACK_BUILD_ID_IP;
 			id_offs[i].ip = ips[i];
-- 
2.39.1