--- zzzz-none-000/linux-3.10.107/lib/sort.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/lib/sort.c	2021-02-04 17:41:59.000000000 +0000
@@ -4,10 +4,15 @@
  * Jan 23 2005  Matt Mackall <mpm@selenic.com>
  */
 
-#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/export.h>
 #include <linux/sort.h>
-#include <linux/slab.h>
+
+static int alignment_ok(const void *base, int align)
+{
+	return IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+		((unsigned long)base & (align - 1)) == 0;
+}
 
 static void u32_swap(void *a, void *b, int size)
 {
@@ -16,6 +21,13 @@
 	*(u32 *)b = t;
 }
 
+static void u64_swap(void *a, void *b, int size)
+{
+	u64 t = *(u64 *)a;
+	*(u64 *)a = *(u64 *)b;
+	*(u64 *)b = t;
+}
+
 static void generic_swap(void *a, void *b, int size)
 {
 	char t;
@@ -51,8 +63,14 @@
 	/* pre-scale counters for performance */
 	int i = (num/2 - 1) * size, n = num * size, c, r;
 
-	if (!swap_func)
-		swap_func = (size == 4 ? u32_swap : generic_swap);
+	if (!swap_func) {
+		if (size == 4 && alignment_ok(base, 4))
+			swap_func = u32_swap;
+		else if (size == 8 && alignment_ok(base, 8))
+			swap_func = u64_swap;
+		else
+			swap_func = generic_swap;
+	}
 
 	/* heapify */
 	for ( ; i >= 0; i -= size) {
@@ -85,6 +103,7 @@
 EXPORT_SYMBOL(sort);
 
 #if 0
+#include <linux/slab.h>
 /* a simple boot-time regression test */
 
 int cmpint(const void *a, const void *b)