From 41b41fefb38900e12e709137a35565cceb0bf02b Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Mon, 6 Apr 2026 15:03:29 +0200
Subject: [PATCH] utils: forbid the use of std::less on pointers in TopoSort

---
 kernel/utils.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/utils.h b/kernel/utils.h
index 1d6c038fd..e71fb4911 100644
--- a/kernel/utils.h
+++ b/kernel/utils.h
@@ -131,6 +131,8 @@ public:
 
 template <typename T, typename C = std::less<T>> class TopoSort
 {
+	static_assert(!(std::is_pointer<T>::value && std::is_same<C, std::less<T>>::value),
+			"std::less is run-to-run unstable for pointers");
 public:
 	// We use this ordering of the edges in the adjacency matrix for
 	// exact compatibility with an older implementation.