1 files changed, 56 insertions, 0 deletions

diff --git a/lib/bitmap.c b/lib/bitmap.c
index d8f0c094b18e..47fe6441562c 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1214,3 +1214,59 @@ void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int n
 }
 EXPORT_SYMBOL(bitmap_copy_le);
 #endif
+
+#if BITS_PER_LONG == 64
+/**
+ * bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap
+ *      @bitmap: array of unsigned longs, the destination bitmap
+ *      @buf: array of u32 (in host byte order), the source bitmap
+ *      @nbits: number of bits in @bitmap
+ */
+void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf,
+                                                unsigned int nbits)
+{
+        unsigned int i, halfwords;
+
+        if (!nbits)
+                return;
+
+        halfwords = DIV_ROUND_UP(nbits, 32);
+        for (i = 0; i < halfwords; i++) {
+                bitmap[i/2] = (unsigned long) buf[i];
+                if (++i < halfwords)
+                        bitmap[i/2] |= ((unsigned long) buf[i]) << 32;
+        }
+
+        /* Clear tail bits in last word beyond nbits. */
+        if (nbits % BITS_PER_LONG)
+                bitmap[(halfwords - 1) / 2] &= BITMAP_LAST_WORD_MASK(nbits);
+}
+EXPORT_SYMBOL(bitmap_from_arr32);
+
+/**
+ * bitmap_to_arr32 - copy the contents of bitmap to a u32 array of bits
+ *      @buf: array of u32 (in host byte order), the dest bitmap
+ *      @bitmap: array of unsigned longs, the source bitmap
+ *      @nbits: number of bits in @bitmap
+ */
+void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, unsigned int nbits)
+{
+        unsigned int i, halfwords;
+
+        if (!nbits)
+                return;
+
+        halfwords = DIV_ROUND_UP(nbits, 32);
+        for (i = 0; i < halfwords; i++) {
+                buf[i] = (u32) (bitmap[i/2] & UINT_MAX);
+                if (++i < halfwords)
+                        buf[i] = (u32) (bitmap[i/2] >> 32);
+        }
+
+        /* Clear tail bits in last element of array beyond nbits. */
+        if (nbits % BITS_PER_LONG)
+                buf[halfwords - 1] &= (u32) (UINT_MAX >> ((-nbits) & 31));
+}
+EXPORT_SYMBOL(bitmap_to_arr32);
+
+#endif