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-rw-r--r--tools/objtool/check.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 3a31b238f885..38047c6aa575 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -543,6 +543,28 @@ static int add_jump_destinations(struct objtool_file *file)
dest_off);
return -1;
}
+
+ /*
+ * For GCC 8+, create parent/child links for any cold
+ * subfunctions. This is _mostly_ redundant with a similar
+ * initialization in read_symbols().
+ *
+ * If a function has aliases, we want the *first* such function
+ * in the symbol table to be the subfunction's parent. In that
+ * case we overwrite the initialization done in read_symbols().
+ *
+ * However this code can't completely replace the
+ * read_symbols() code because this doesn't detect the case
+ * where the parent function's only reference to a subfunction
+ * is through a switch table.
+ */
+ if (insn->func && insn->jump_dest->func &&
+ insn->func != insn->jump_dest->func &&
+ !strstr(insn->func->name, ".cold.") &&
+ strstr(insn->jump_dest->func->name, ".cold.")) {
+ insn->func->cfunc = insn->jump_dest->func;
+ insn->jump_dest->func->pfunc = insn->func;
+ }
}
return 0;