v4.19.13 snapshot.
diff --git a/arch/arm/mm/fault.h b/arch/arm/mm/fault.h
new file mode 100644
index 0000000..c063708
--- /dev/null
+++ b/arch/arm/mm/fault.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ARCH_ARM_FAULT_H
+#define __ARCH_ARM_FAULT_H
+
+/*
+ * Fault status register encodings. We steal bit 31 for our own purposes.
+ */
+#define FSR_LNX_PF (1 << 31)
+#define FSR_WRITE (1 << 11)
+#define FSR_FS4 (1 << 10)
+#define FSR_FS3_0 (15)
+#define FSR_FS5_0 (0x3f)
+
+#ifdef CONFIG_ARM_LPAE
+#define FSR_FS_AEA 17
+
+static inline int fsr_fs(unsigned int fsr)
+{
+ return fsr & FSR_FS5_0;
+}
+#else
+#define FSR_FS_AEA 22
+
+static inline int fsr_fs(unsigned int fsr)
+{
+ return (fsr & FSR_FS3_0) | (fsr & FSR_FS4) >> 6;
+}
+#endif
+
+void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
+void early_abt_enable(void);
+
+#endif /* __ARCH_ARM_FAULT_H */