diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 67e5ebe25097..1479f5c89cea 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -1430,14 +1430,20 @@
 	par;								\
 })
 
+/*
+ * Disallow any use of the following backported SYS_FIELD macros. They rely on
+ * use of pre-shifted masked (for example, as generated by GENMASK). Most of
+ * the masks defined in this tree are not shifted, making these macros subtly
+ * dangerous!
+ */
 #define SYS_FIELD_GET(reg, field, val)		\
-		 FIELD_GET(reg##_##field##_MASK, val)
+		 BUILD_BUG()
 
 #define SYS_FIELD_PREP(reg, field, val)		\
-		 FIELD_PREP(reg##_##field##_MASK, val)
+		 BUILD_BUG()
 
 #define SYS_FIELD_PREP_ENUM(reg, field, val)		\
-		 FIELD_PREP(reg##_##field##_MASK, reg##_##field##_##val)
+		 BUILD_BUG()
 
 #endif