From: Josh Poimboeuf jpoimboe@kernel.org
[ Upstream commit 3724062ca2b1364f02cf44dbea1a552227844ad1 ]
Clang sometimes leaves dangling unused jump table entries which point to the end of the function. Ignore them.
Closes: https://lore.kernel.org/20250113235835.vqgvb7cdspksy5dn@jpoimboe Reported-by: Klaus Kusche klaus.kusche@computerix.info Signed-off-by: Josh Poimboeuf jpoimboe@kernel.org Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: https://lkml.kernel.org/r/ee25c0b7e80113e950bd1d4c208b671d35774ff4.173689175... Signed-off-by: Sasha Levin sashal@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 f0d8796b984a8..34b1c16d359c9 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); }