tools/resolve_btfids: Warn when having multiple IDs for single type

The kernel image can contain multiple types (structs/unions)
with the same name. This causes distinct type hierarchies in
BTF data and makes resolve_btfids fail with error like:

  BTFIDS  vmlinux
FAILED unresolved symbol udp6_sock

as reported by Qais Yousef [1].

This change adds warning when multiple types of the same name
are detected:

  BTFIDS  vmlinux
WARN: multiple IDs found for 'file': 526, 113351 - using 526
WARN: multiple IDs found for 'sk_buff': 2744, 113958 - using 2744

We keep the lower ID for the given type instance and let the
build continue.

Also changing the 'nr' variable name to 'nr_types' to avoid confusion.

[1] https://lore.kernel.org/lkml/20201229151352.6hzmjvu3qh6p2qgg@e107158-lin/

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210105234219.970039-1-jolsa@kernel.org

diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index e3ea569..7409d78 100644 (file)
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -139,6 +139,8 @@ int eprintf(int level, int var, const char *fmt, ...)
 #define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_err(fmt, ...) \
        eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
+#define pr_info(fmt, ...) \
+       eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
 
 static bool is_btf_id(const char *name)
 {
@@ -472,7 +474,7 @@ static int symbols_resolve(struct object *obj)
        int nr_funcs    = obj->nr_funcs;
        int err, type_id;
        struct btf *btf;
-       __u32 nr;
+       __u32 nr_types;
 
        btf = btf__parse(obj->btf ?: obj->path, NULL);
        err = libbpf_get_error(btf);
@@ -483,12 +485,12 @@ static int symbols_resolve(struct object *obj)
        }
 
        err = -1;
-       nr  = btf__get_nr_types(btf);
+       nr_types = btf__get_nr_types(btf);
 
        /*
         * Iterate all the BTF types and search for collected symbol IDs.
         */
-       for (type_id = 1; type_id <= nr; type_id++) {
+       for (type_id = 1; type_id <= nr_types; type_id++) {
                const struct btf_type *type;
                struct rb_root *root;
                struct btf_id *id;
@@ -526,8 +528,13 @@ static int symbols_resolve(struct object *obj)
 
                id = btf_id__find(root, str);
                if (id) {
-                       id->id = type_id;
-                       (*nr)--;
+                       if (id->id) {
+                               pr_info("WARN: multiple IDs found for '%s': %d, %d - using %d\n",
+                                       str, id->id, type_id, id->id);
+                       } else {
+                               id->id = type_id;
+                               (*nr)--;
+                       }
                }
        }