objtool: Ignore unwind hints for ignored functions

If a function is ignored, also ignore its hints.  This is useful for the
case where the function ignore is conditional on frame pointers, e.g.
STACK_FRAME_NON_STANDARD_FP().

Link: https://lkml.kernel.org/r/163163048317.489837.10988954983369863209.stgit@devnote2
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e5947fb..67cbdcf 100644 (file)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2909,7 +2909,7 @@ static int validate_unwind_hints(struct objtool_file *file, struct section *sec)
        }
 
        while (&insn->list != &file->insn_list && (!sec || insn->sec == sec)) {
-               if (insn->hint && !insn->visited) {
+               if (insn->hint && !insn->visited && !insn->ignore) {
                        ret = validate_branch(file, insn->func, insn, state);
                        if (ret && backtrace)
                                BT_FUNC("<=== (hint)", insn);