From 4e37394a11df4abb3adbb3dfa49429b9c38b66cd Mon Sep 17 00:00:00 2001
From: Tim Schumacher <timschumi@gmx.de>
Date: Tue, 14 Apr 2026 20:35:49 +0200
Subject: [PATCH] linux/common-config: Disable DAX on 32-bit hosts

---
 pkgs/os-specific/linux/kernel/common-config.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 6d1015afdcfe..970bb43b9b2a 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -685,7 +685,8 @@ let
       FANOTIFY = yes;
       FANOTIFY_ACCESS_PERMISSIONS = yes;
 
-      FS_DAX = yes;
+      # DAX requires 64BIT via ZONE_DEVICE and MEMORY_HOTPLUG.
+      FS_DAX = lib.mkIf stdenv.hostPlatform.is64bit yes;
 
       TMPFS = yes;
       TMPFS_POSIX_ACL = yes;