From: Alexandre Chartre <alexandre.chartre@oracle.com>
Date: Fri, 21 Nov 2025 09:53:28 +0000 (+0100)
Subject: objtool: Preserve alternatives order
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7ad7a4a72050a74f8927719272075d07d2f7777f;p=thirdparty%2Fkernel%2Flinux.git

objtool: Preserve alternatives order

Preserve the order in which alternatives are defined. Currently
objtool stores alternatives in a list in reverse order.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://patch.msgid.link/20251121095340.464045-19-alexandre.chartre@oracle.com
---

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 9cd9f9d4f6565..f75364f20bf14 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1921,6 +1921,7 @@ static int add_special_section_alts(struct objtool_file *file)
 	struct special_alt *special_alt, *tmp;
 	enum alternative_type alt_type;
 	struct alternative *alt;
+	struct alternative *a;
 
 	if (special_get_alts(file->elf, &special_alts))
 		return -1;
@@ -1973,9 +1974,20 @@ static int add_special_section_alts(struct objtool_file *file)
 		}
 
 		alt->insn = new_insn;
-		alt->next = orig_insn->alts;
 		alt->type = alt_type;
-		orig_insn->alts = alt;
+		alt->next = NULL;
+
+		/*
+		 * Store alternatives in the same order they have been
+		 * defined.
+		 */
+		if (!orig_insn->alts) {
+			orig_insn->alts = alt;
+		} else {
+			for (a = orig_insn->alts; a->next; a = a->next)
+				;
+			a->next = alt;
+		}
 
 		list_del(&special_alt->list);
 		free(special_alt);