v4.19.13 snapshot.
diff --git a/include/asm-generic/error-injection.h b/include/asm-generic/error-injection.h
new file mode 100644
index 0000000..296c654
--- /dev/null
+++ b/include/asm-generic/error-injection.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_GENERIC_ERROR_INJECTION_H
+#define _ASM_GENERIC_ERROR_INJECTION_H
+
+#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
+enum {
+ EI_ETYPE_NONE, /* Dummy value for undefined case */
+ EI_ETYPE_NULL, /* Return NULL if failure */
+ EI_ETYPE_ERRNO, /* Return -ERRNO if failure */
+ EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */
+};
+
+struct error_injection_entry {
+ unsigned long addr;
+ int etype;
+};
+
+#ifdef CONFIG_FUNCTION_ERROR_INJECTION
+/*
+ * Whitelist ganerating macro. Specify functions which can be
+ * error-injectable using this macro.
+ */
+#define ALLOW_ERROR_INJECTION(fname, _etype) \
+static struct error_injection_entry __used \
+ __attribute__((__section__("_error_injection_whitelist"))) \
+ _eil_addr_##fname = { \
+ .addr = (unsigned long)fname, \
+ .etype = EI_ETYPE_##_etype, \
+ };
+#else
+#define ALLOW_ERROR_INJECTION(fname, _etype)
+#endif
+#endif
+
+#endif /* _ASM_GENERIC_ERROR_INJECTION_H */