v4.19.13 snapshot.
diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
new file mode 100644
index 0000000..fd06dbe
--- /dev/null
+++ b/arch/powerpc/include/asm/bug.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_BUG_H
+#define _ASM_POWERPC_BUG_H
+#ifdef __KERNEL__
+
+#include <asm/asm-compat.h>
+
+/*
+ * Define an illegal instr to trap on the bug.
+ * We don't use 0 because that marks the end of a function
+ * in the ELF ABI. That's "Boo Boo" in case you wonder...
+ */
+#define BUG_OPCODE .long 0x00b00b00 /* For asm */
+#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
+
+#ifdef CONFIG_BUG
+
+#ifdef __ASSEMBLY__
+#include <asm/asm-offsets.h>
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+.macro EMIT_BUG_ENTRY addr,file,line,flags
+ .section __bug_table,"aw"
+5001: PPC_LONG \addr, 5002f
+ .short \line, \flags
+ .org 5001b+BUG_ENTRY_SIZE
+ .previous
+ .section .rodata,"a"
+5002: .asciz "\file"
+ .previous
+.endm
+#else
+.macro EMIT_BUG_ENTRY addr,file,line,flags
+ .section __bug_table,"aw"
+5001: PPC_LONG \addr
+ .short \flags
+ .org 5001b+BUG_ENTRY_SIZE
+ .previous
+.endm
+#endif /* verbose */
+
+#else /* !__ASSEMBLY__ */
+/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
+ sizeof(struct bug_entry), respectively */
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+#define _EMIT_BUG_ENTRY \
+ ".section __bug_table,\"aw\"\n" \
+ "2:\t" PPC_LONG "1b, %0\n" \
+ "\t.short %1, %2\n" \
+ ".org 2b+%3\n" \
+ ".previous\n"
+#else
+#define _EMIT_BUG_ENTRY \
+ ".section __bug_table,\"aw\"\n" \
+ "2:\t" PPC_LONG "1b\n" \
+ "\t.short %2\n" \
+ ".org 2b+%3\n" \
+ ".previous\n"
+#endif
+
+/*
+ * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
+ * optimisations. However depending on the complexity of the condition
+ * some compiler versions may not produce optimal results.
+ */
+
+#define BUG() do { \
+ __asm__ __volatile__( \
+ "1: twi 31,0,0\n" \
+ _EMIT_BUG_ENTRY \
+ : : "i" (__FILE__), "i" (__LINE__), \
+ "i" (0), "i" (sizeof(struct bug_entry))); \
+ unreachable(); \
+} while (0)
+
+#define BUG_ON(x) do { \
+ if (__builtin_constant_p(x)) { \
+ if (x) \
+ BUG(); \
+ } else { \
+ __asm__ __volatile__( \
+ "1: "PPC_TLNEI" %4,0\n" \
+ _EMIT_BUG_ENTRY \
+ : : "i" (__FILE__), "i" (__LINE__), "i" (0), \
+ "i" (sizeof(struct bug_entry)), \
+ "r" ((__force long)(x))); \
+ } \
+} while (0)
+
+#define __WARN_FLAGS(flags) do { \
+ __asm__ __volatile__( \
+ "1: twi 31,0,0\n" \
+ _EMIT_BUG_ENTRY \
+ : : "i" (__FILE__), "i" (__LINE__), \
+ "i" (BUGFLAG_WARNING|(flags)), \
+ "i" (sizeof(struct bug_entry))); \
+} while (0)
+
+#define WARN_ON(x) ({ \
+ int __ret_warn_on = !!(x); \
+ if (__builtin_constant_p(__ret_warn_on)) { \
+ if (__ret_warn_on) \
+ __WARN(); \
+ } else { \
+ __asm__ __volatile__( \
+ "1: "PPC_TLNEI" %4,0\n" \
+ _EMIT_BUG_ENTRY \
+ : : "i" (__FILE__), "i" (__LINE__), \
+ "i" (BUGFLAG_WARNING|BUGFLAG_TAINT(TAINT_WARN)),\
+ "i" (sizeof(struct bug_entry)), \
+ "r" (__ret_warn_on)); \
+ } \
+ unlikely(__ret_warn_on); \
+})
+
+#define HAVE_ARCH_BUG
+#define HAVE_ARCH_BUG_ON
+#define HAVE_ARCH_WARN_ON
+#endif /* __ASSEMBLY __ */
+#else
+#ifdef __ASSEMBLY__
+.macro EMIT_BUG_ENTRY addr,file,line,flags
+.endm
+#else /* !__ASSEMBLY__ */
+#define _EMIT_BUG_ENTRY
+#endif
+#endif /* CONFIG_BUG */
+
+#include <asm-generic/bug.h>
+
+#ifndef __ASSEMBLY__
+
+struct pt_regs;
+extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
+extern void bad_page_fault(struct pt_regs *, unsigned long, int);
+extern void _exception(int, struct pt_regs *, int, unsigned long);
+extern void _exception_pkey(int, struct pt_regs *, int, unsigned long, int);
+extern void die(const char *, struct pt_regs *, long);
+extern bool die_will_crash(void);
+extern void panic_flush_kmsg_start(void);
+extern void panic_flush_kmsg_end(void);
+#endif /* !__ASSEMBLY__ */
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_BUG_H */