v4.19.13 snapshot.
diff --git a/include/linux/bug.h b/include/linux/bug.h
new file mode 100644
index 0000000..fe59165
--- /dev/null
+++ b/include/linux/bug.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_BUG_H
+#define _LINUX_BUG_H
+
+#include <asm/bug.h>
+#include <linux/compiler.h>
+#include <linux/build_bug.h>
+
+enum bug_trap_type {
+ BUG_TRAP_TYPE_NONE = 0,
+ BUG_TRAP_TYPE_WARN = 1,
+ BUG_TRAP_TYPE_BUG = 2,
+};
+
+struct pt_regs;
+
+#ifdef __CHECKER__
+#define MAYBE_BUILD_BUG_ON(cond) (0)
+#else /* __CHECKER__ */
+
+#define MAYBE_BUILD_BUG_ON(cond) \
+ do { \
+ if (__builtin_constant_p((cond))) \
+ BUILD_BUG_ON(cond); \
+ else \
+ BUG_ON(cond); \
+ } while (0)
+
+#endif /* __CHECKER__ */
+
+#ifdef CONFIG_GENERIC_BUG
+#include <asm-generic/bug.h>
+
+static inline int is_warning_bug(const struct bug_entry *bug)
+{
+ return bug->flags & BUGFLAG_WARNING;
+}
+
+struct bug_entry *find_bug(unsigned long bugaddr);
+
+enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
+
+/* These are defined by the architecture */
+int is_valid_bugaddr(unsigned long addr);
+
+void generic_bug_clear_once(void);
+
+#else /* !CONFIG_GENERIC_BUG */
+
+static inline enum bug_trap_type report_bug(unsigned long bug_addr,
+ struct pt_regs *regs)
+{
+ return BUG_TRAP_TYPE_BUG;
+}
+
+
+static inline void generic_bug_clear_once(void) {}
+
+#endif /* CONFIG_GENERIC_BUG */
+
+/*
+ * Since detected data corruption should stop operation on the affected
+ * structures. Return value must be checked and sanely acted on by caller.
+ */
+static inline __must_check bool check_data_corruption(bool v) { return v; }
+#define CHECK_DATA_CORRUPTION(condition, fmt, ...) \
+ check_data_corruption(({ \
+ bool corruption = unlikely(condition); \
+ if (corruption) { \
+ if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
+ pr_err(fmt, ##__VA_ARGS__); \
+ BUG(); \
+ } else \
+ WARN(1, fmt, ##__VA_ARGS__); \
+ } \
+ corruption; \
+ }))
+
+#endif /* _LINUX_BUG_H */