---
 kexec/mem_regions.c | 27 +++++++++++++++++++++++++++
 kexec/mem_regions.h |  2 ++
 2 files changed, 29 insertions(+)

diff --git a/kexec/mem_regions.c b/kexec/mem_regions.c
index a4952ff..804984a 100644
--- a/kexec/mem_regions.c
+++ b/kexec/mem_regions.c

@@ -1,6 +1,33 @@
+#include <stdlib.h>
+
 #include "kexec.h"
 #include "mem_regions.h"

+static int mem_range_cmp(const void *a1, const void *a2)
+{
+       const struct memory_range *r1 = a1;
+       const struct memory_range *r2 = a2;
+
+       if (r1->start > r2->start)
+               return 1;
+       if (r1->start < r2->start)
+               return -1;
+
+       return 0;
+}
+
+/**
+ * mem_regions_sort() - sort ranges into ascending address order
+ * @ranges: ranges to sort
+ *
+ * Sort the memory regions into ascending address order.
+ */
+void mem_regions_sort(struct memory_ranges *ranges)
+{
+       qsort(ranges->ranges, ranges->size, sizeof(ranges->ranges),
+             mem_range_cmp);
+}
+
 /**
  * mem_regions_add() - add a memory region to a set of ranges
  * @ranges: ranges to add the memory region to

diff --git a/kexec/mem_regions.h b/kexec/mem_regions.h
index b9cfba1..da7b5e8 100644
--- a/kexec/mem_regions.h
+++ b/kexec/mem_regions.h

@@ -3,6 +3,8 @@

 struct memory_ranges;

+void mem_regions_sort(struct memory_ranges *ranges);
+
 int mem_regions_add(struct memory_ranges *ranges, unsigned long long base,
                     unsigned long long length, int type);

--

1.9.1