v4.19.13 snapshot.
diff --git a/arch/arm/include/asm/compiler.h b/arch/arm/include/asm/compiler.h
new file mode 100644
index 0000000..5e94e67
--- /dev/null
+++ b/arch/arm/include/asm/compiler.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_ARM_COMPILER_H
+#define __ASM_ARM_COMPILER_H
+
+/*
+ * This is used to ensure the compiler did actually allocate the register we
+ * asked it for some inline assembly sequences. Apparently we can't trust
+ * the compiler from one version to another so a bit of paranoia won't hurt.
+ * This string is meant to be concatenated with the inline asm string and
+ * will cause compilation to stop on mismatch.
+ * (for details, see gcc PR 15089)
+ * For compatibility with clang, we have to specifically take the equivalence
+ * of 'r11' <-> 'fp' and 'r12' <-> 'ip' into account as well.
+ */
+#define __asmeq(x, y) \
+ ".ifnc " x "," y "; " \
+ ".ifnc " x y ",fpr11; " \
+ ".ifnc " x y ",r11fp; " \
+ ".ifnc " x y ",ipr12; " \
+ ".ifnc " x y ",r12ip; " \
+ ".err; " \
+ ".endif; " \
+ ".endif; " \
+ ".endif; " \
+ ".endif; " \
+ ".endif\n\t"
+
+
+#endif /* __ASM_ARM_COMPILER_H */