diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index b06240b67199..fd5f54b9c863 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -26,6 +26,15 @@
 # define nmi_uaccess_okay() true
 #endif
 
+/*
+ * Blindly accessing user memory from NMI context can be dangerous
+ * if we're in the middle of switching the current user task or switching
+ * the loaded mm.
+ */
+#ifndef nmi_uaccess_okay
+# define nmi_uaccess_okay() true
+#endif
+
 #ifdef CONFIG_MMU
 
 /*