2 files changed, 23 insertions, 0 deletions

diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index 89781fd48859..5379913aca52 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -130,6 +130,7 @@ extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,
 extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
 extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
 extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
+extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
 
 #define BITMAP_LAST_WORD_MASK(nbits)                                    \
 (                                                                       \
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 06fb57c86de0..c2006bfeea41 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1007,3 +1007,25 @@ int bitmap_allocate_region(unsigned long *bitmap, int pos, int order)
         return 0;
 }
 EXPORT_SYMBOL(bitmap_allocate_region);
+
+/**
+ * bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.
+ * @dst:   destination buffer
+ * @src:   bitmap to copy
+ * @nbits: number of bits in the bitmap
+ *
+ * Require nbits % BITS_PER_LONG == 0.
+ */
+void bitmap_copy_le(void *dst, const unsigned long *src, int nbits)
+{
+        unsigned long *d = dst;
+        int i;
+
+        for (i = 0; i < nbits/BITS_PER_LONG; i++) {
+                if (BITS_PER_LONG == 64)
+                        d[i] = cpu_to_le64(src[i]);
+                else
+                        d[i] = cpu_to_le32(src[i]);
+        }
+}
+EXPORT_SYMBOL(bitmap_copy_le);