1 files changed, 13 insertions, 0 deletions
diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h
index 679f1bd..5c31334 100644
--- a/include/qemu/bitmap.h
+++ b/include/qemu/bitmap.h
@@ -232,6 +232,19 @@ static inline long bitmap_count_one(const unsigned long *bitmap, long nbits)
     }
 }
 
+static inline long bitmap_count_one_with_offset(const unsigned long *bitmap,
+                                                long offset, long nbits)
+{
+    long aligned_offset = QEMU_ALIGN_DOWN(offset, BITS_PER_LONG);
+    long redundant_bits = offset - aligned_offset;
+    long bits_to_count = nbits + redundant_bits;
+    const unsigned long *bitmap_start = bitmap +
+                                        aligned_offset / BITS_PER_LONG;
+
+    return bitmap_count_one(bitmap_start, bits_to_count) -
+           bitmap_count_one(bitmap_start, redundant_bits);
+}
+
 void bitmap_set(unsigned long *map, long i, long len);
 void bitmap_set_atomic(unsigned long *map, long i, long len);
 void bitmap_clear(unsigned long *map, long start, long nr);