v4.19.13 snapshot.
diff --git a/lib/gen_crc64table.c b/lib/gen_crc64table.c
new file mode 100644
index 0000000..9011926
--- /dev/null
+++ b/lib/gen_crc64table.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generate lookup table for the table-driven CRC64 calculation.
+ *
+ * gen_crc64table is executed in kernel build time and generates
+ * lib/crc64table.h. This header is included by lib/crc64.c for
+ * the table-driven CRC64 calculation.
+ *
+ * See lib/crc64.c for more information about which specification
+ * and polynomial arithmetic that gen_crc64table.c follows to
+ * generate the lookup table.
+ *
+ * Copyright 2018 SUSE Linux.
+ * Author: Coly Li <colyli@suse.de>
+ */
+#include <inttypes.h>
+#include <stdio.h>
+
+#include <linux/swab.h>
+
+#define CRC64_ECMA182_POLY 0x42F0E1EBA9EA3693ULL
+
+static uint64_t crc64_table[256] = {0};
+
+static void generate_crc64_table(void)
+{
+ uint64_t i, j, c, crc;
+
+ for (i = 0; i < 256; i++) {
+ crc = 0;
+ c = i << 56;
+
+ for (j = 0; j < 8; j++) {
+ if ((crc ^ c) & 0x8000000000000000ULL)
+ crc = (crc << 1) ^ CRC64_ECMA182_POLY;
+ else
+ crc <<= 1;
+ c <<= 1;
+ }
+
+ crc64_table[i] = crc;
+ }
+}
+
+static void print_crc64_table(void)
+{
+ int i;
+
+ printf("/* this file is generated - do not edit */\n\n");
+ printf("#include <linux/types.h>\n");
+ printf("#include <linux/cache.h>\n\n");
+ printf("static const u64 ____cacheline_aligned crc64table[256] = {\n");
+ for (i = 0; i < 256; i++) {
+ printf("\t0x%016" PRIx64 "ULL", crc64_table[i]);
+ if (i & 0x1)
+ printf(",\n");
+ else
+ printf(", ");
+ }
+ printf("};\n");
+}
+
+int main(int argc, char *argv[])
+{
+ generate_crc64_table();
+ print_crc64_table();
+ return 0;
+}