kpatch/0036-lookup-skip-finding-local-symbols-for-object-with-no.patch

From cb75d02d8b8a773386ef3867457d600752a9ec4b Mon Sep 17 00:00:00 2001
From: hubin <hubin73@huawei.com>
Date: Sun, 9 Oct 2022 10:34:52 +0800
Subject: [PATCH 36/37] lookup: skip finding local symbols for object with no
 local symbols

Signed-off-by: hubin <hubin73@huawei.com>
---
 kpatch-build/lookup.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/kpatch-build/lookup.c b/kpatch-build/lookup.c
index d3b6ae9..4b1717a 100644
--- a/kpatch-build/lookup.c
+++ b/kpatch-build/lookup.c
@@ -166,6 +166,22 @@ static bool locals_match(struct lookup_table *table, int idx,
 	return true;
 }
 
+static int count_local_symbol(struct list_head *sym_list)
+{
+	struct symbol *sym;
+	int sym_num = 0;
+
+	list_for_each_entry(sym, sym_list, list) {
+		if (sym->bind != STB_LOCAL)
+			continue;
+		if (sym->type != STT_FUNC && sym->type != STT_OBJECT)
+			continue;
+		sym_num++;
+	}
+
+	return sym_num;
+}
+
 static void find_local_syms(struct lookup_table *table, struct symbol *file_sym,
 		struct list_head *sym_list)
 {
@@ -173,6 +189,9 @@ static void find_local_syms(struct lookup_table *table, struct symbol *file_sym,
 	struct object_symbol *lookup_table_file_sym = NULL;
 	int i;
 
+	if (count_local_symbol(sym_list) == 0)
+		return;
+
 	for_each_obj_symbol(i, sym, table) {
 		if (sym->type != STT_FILE)
 			continue;
-- 
2.33.0