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objtool: Ignore dangling jump table entries

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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/ee25c0b7e80113e950bd1d4c208b671d35774ff4.1736891751.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2025-01-14 13:57:58 -08:00 • committed by Peter Zijlstra
parent 2014c95afe
commit 3724062ca2
1 changed files with 9 additions and 0 deletions
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9
tools/objtool/check.c
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@ -1975,6 +1975,14 @@ 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;
@ -1992,6 +2000,7 @@ 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);
}