Clang sometimes leaves dangling unused jump table entries which point to
the end of the function. Ignore them.
Reported-by: Klaus Kusche <klaus.kusche@computerix.info>
Closes: https://lore.kernel.org/20250113235835.vqgvb7cdspksy5dn@jpoimboe
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
tools/objtool/check.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 76060da755b5..4a0c5bb7e457 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2099,6 +2099,14 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
reloc_addend(reloc) == pfunc->offset)
break;
+ /*
+ * Clang sometimes leaves dangling unused jump table entries
+ * which point to the end of the function. Ignore them.
+ */
+ if (reloc->sym->sec == pfunc->sec &&
+ reloc_addend(reloc) == pfunc->offset + pfunc->len)
+ goto next;
+
dest_insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!dest_insn)
break;
@@ -2116,6 +2124,7 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
alt->insn = dest_insn;
alt->next = insn->alts;
insn->alts = alt;
+next:
prev_offset = reloc_offset(reloc);
}
--
2.47.1