[PATCH v3 11/15] objtool: Remove too strict constraint in jump table search

[Christophe Leroy]

In code there is often a pattern like:

        load jump table address
        do some test
        conditional jump to label1:
        do something
        unconditional jump to label2:
label1:
        do something else
        read jump table
        dynamic jump
label2:
        do other job here ....

find_jump_table() contains a constraint that stops the backsearch
of the table address loading when a jump is found in-between.

Remove that constraint.

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 tools/objtool/check.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 05d789e6d3b6..c9f0fd31d146 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2067,13 +2067,6 @@ static struct reloc *find_jump_table(struct objtool_file 
*file,
                if (insn != orig_insn && insn->type == INSN_JUMP_DYNAMIC)
                        break;
 
-               /* allow small jumps within the range */
-               if (insn->type == INSN_JUMP_UNCONDITIONAL &&
-                   insn->jump_dest &&
-                   (insn->jump_dest->offset <= insn->offset ||
-                    insn->jump_dest->offset > orig_insn->offset))
-                   break;
-
                table_reloc = arch_find_switch_table(file, insn);
                if (!table_reloc)
                        continue;
-- 
2.40.1