v4.19.13 snapshot.
diff --git a/include/linux/fault-inject.h b/include/linux/fault-inject.h
new file mode 100644
index 0000000..7e6c777
--- /dev/null
+++ b/include/linux/fault-inject.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_FAULT_INJECT_H
+#define _LINUX_FAULT_INJECT_H
+
+#ifdef CONFIG_FAULT_INJECTION
+
+#include <linux/types.h>
+#include <linux/debugfs.h>
+#include <linux/ratelimit.h>
+#include <linux/atomic.h>
+
+/*
+ * For explanation of the elements of this struct, see
+ * Documentation/fault-injection/fault-injection.txt
+ */
+struct fault_attr {
+ unsigned long probability;
+ unsigned long interval;
+ atomic_t times;
+ atomic_t space;
+ unsigned long verbose;
+ bool task_filter;
+ unsigned long stacktrace_depth;
+ unsigned long require_start;
+ unsigned long require_end;
+ unsigned long reject_start;
+ unsigned long reject_end;
+
+ unsigned long count;
+ struct ratelimit_state ratelimit_state;
+ struct dentry *dname;
+};
+
+#define FAULT_ATTR_INITIALIZER { \
+ .interval = 1, \
+ .times = ATOMIC_INIT(1), \
+ .require_end = ULONG_MAX, \
+ .stacktrace_depth = 32, \
+ .ratelimit_state = RATELIMIT_STATE_INIT_DISABLED, \
+ .verbose = 2, \
+ .dname = NULL, \
+ }
+
+#define DECLARE_FAULT_ATTR(name) struct fault_attr name = FAULT_ATTR_INITIALIZER
+int setup_fault_attr(struct fault_attr *attr, char *str);
+bool should_fail(struct fault_attr *attr, ssize_t size);
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+
+struct dentry *fault_create_debugfs_attr(const char *name,
+ struct dentry *parent, struct fault_attr *attr);
+
+#else /* CONFIG_FAULT_INJECTION_DEBUG_FS */
+
+static inline struct dentry *fault_create_debugfs_attr(const char *name,
+ struct dentry *parent, struct fault_attr *attr)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
+
+#endif /* CONFIG_FAULT_INJECTION */
+
+struct kmem_cache;
+
+int should_failslab(struct kmem_cache *s, gfp_t gfpflags);
+#ifdef CONFIG_FAILSLAB
+extern bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags);
+#else
+static inline bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
+{
+ return false;
+}
+#endif /* CONFIG_FAILSLAB */
+
+#endif /* _LINUX_FAULT_INJECT_H */