[PATCH v3 11/21] objtool: Allow empty alternatives

[Josh Poimboeuf <jpoimboe@kernel.org>]

arm64 can have empty alternatives, which are effectively no-ops.  Ignore
them.  While at it, fix a memory leak.

Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 tools/objtool/check.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 73451aef68029..e05dc7a93dc1e 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1953,6 +1953,9 @@ static int add_special_section_alts(struct objtool_file *file)
 
 	list_for_each_entry_safe(special_alt, tmp, &special_alts, list) {
 
+		if (special_alt->group && !special_alt->orig_len)
+			goto next;
+
 		orig_insn = find_insn(file, special_alt->orig_sec,
 				      special_alt->orig_off);
 		if (!orig_insn) {
@@ -1973,10 +1976,6 @@ static int add_special_section_alts(struct objtool_file *file)
 		}
 
 		if (special_alt->group) {
-			if (!special_alt->orig_len) {
-				ERROR_INSN(orig_insn, "empty alternative entry");
-				continue;
-			}
 
 			if (handle_group_alt(file, special_alt, orig_insn, &new_insn))
 				return -1;
@@ -2014,6 +2013,7 @@ static int add_special_section_alts(struct objtool_file *file)
 			a->next = alt;
 		}
 
+next:
 		list_del(&special_alt->list);
 		free(special_alt);
 	}
-- 
2.53.0