[PATCH 09/12] dwarf_loader: Add the cu to the cus list early, remove on LSK_DELETE

[Arnaldo Carvalho de Melo <acme@kernel.org>]

From: Arnaldo Carvalho de Melo <acme@redhat.com>

We want to keep it in the same order as in the original DWARF file we're
loading (e.g. vmlinux), we'll only remove it after we load and process
(e.g. convert to BTF).

Cc: Alan Maguire <alan.maguire@oracle.com>
Cc: Kui-Feng Lee <kuifeng@fb.com>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 dwarf_loader.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/dwarf_loader.c b/dwarf_loader.c
index a097b67a2d123b55..3ef22aada6f46f13 100644
--- a/dwarf_loader.c
+++ b/dwarf_loader.c
@@ -3034,12 +3034,12 @@ static int cus__finalize(struct cus *cus, struct cu *cu, struct conf_load *conf,
 	int lsk = cu__finalize(cu, conf, thr_data);
 	switch (lsk) {
 	case LSK__DELETE:
+		cus__remove(cus, cu);
 		cu__delete(cu);
 		break;
 	case LSK__STOP_LOADING:
 		break;
 	case LSK__KEEPIT:
-		cus__add(cus, cu);
 		break;
 	}
 	return lsk;
@@ -3064,7 +3064,7 @@ static int cu__set_common(struct cu *cu, struct conf_load *conf,
 	return 0;
 }
 
-static int __cus__load_debug_types(struct conf_load *conf, Dwfl_Module *mod, Dwarf *dw, Elf *elf,
+static int __cus__load_debug_types(struct cus *cus, struct conf_load *conf, Dwfl_Module *mod, Dwarf *dw, Elf *elf,
 				   const char *filename, const unsigned char *build_id,
 				   int build_id_len, struct cu **cup, struct dwarf_cu *dcup)
 {
@@ -3098,6 +3098,7 @@ static int __cus__load_debug_types(struct conf_load *conf, Dwfl_Module *mod, Dwa
 			cu->dfops = &dwarf__ops;
 
 			*cup = cu;
+			cus__add(cus, cu);
 		}
 
 		Dwarf_Die die_mem;
@@ -3250,6 +3251,8 @@ static int dwarf_cus__create_and_process_cu(struct dwarf_cus *dcus, Dwarf_Die *c
 	if (dcu == NULL)
 		return DWARF_CB_ABORT;
 
+	cus__add(dcus->cus, dcu->cu);
+
 	return dwarf_cus__process_cu(dcus, cu_die, dcu->cu, NULL);
 }
 
@@ -3282,6 +3285,9 @@ static int dwarf_cus__nextcu(struct dwarf_cus *dcus, struct dwarf_cu **dcu,
 			ret = -1;
 			goto out_unlock;
 		}
+		// Do it here to keep all CUs in cus->cus in the same
+		// order as in the DWARF file being loaded (e.g. vmlinux)
+		__cus__add(dcus->cus, (*dcu)->cu);
 	}
 
 out_unlock:
@@ -3496,15 +3502,15 @@ static int cus__load_module(struct cus *cus, struct conf_load *conf,
 	struct dwarf_cu type_dcu;
 	int type_lsk = LSK__KEEPIT;
 
-	int res = __cus__load_debug_types(conf, mod, dw, elf, filename, build_id, build_id_len, &type_cu, &type_dcu);
+	int res = __cus__load_debug_types(cus, conf, mod, dw, elf, filename, build_id, build_id_len, &type_cu, &type_dcu);
 	if (res != 0) {
 		return res;
 	}
 
 	if (type_cu != NULL) {
 		type_lsk = cu__finalize(type_cu, conf, NULL);
-		if (type_lsk == LSK__KEEPIT) {
-			cus__add(cus, type_cu);
+		if (type_lsk == LSK__DELETE) {
+			cus__remove(cus, type_cu);
 		}
 	}
 
-- 
2.44.0