bitmap: add bitmap_copy_and_clear_atomic
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20170421091632.30900-2-kraxel@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/util/bitmap.c b/util/bitmap.c
index c1a84ca..efced9a 100644
--- a/util/bitmap.c
+++ b/util/bitmap.c
@@ -287,6 +287,17 @@
return dirty != 0;
}
+void bitmap_copy_and_clear_atomic(unsigned long *dst, unsigned long *src,
+ long nr)
+{
+ while (nr > 0) {
+ *dst = atomic_xchg(src, 0);
+ dst++;
+ src++;
+ nr -= BITS_PER_LONG;
+ }
+}
+
#define ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
/**
