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[28/49] bitmap: Add bitmap_zero_extend operation

Message ID 1389634834-24181-29-git-send-email-quintela@redhat.com
State New
Headers show

Commit Message

Juan Quintela Jan. 13, 2014, 5:40 p.m. UTC 
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
---
 include/qemu/bitmap.h | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h
index afdd257..1babd5d 100644
--- a/include/qemu/bitmap.h
+++ b/include/qemu/bitmap.h
@@ -220,4 +220,13 @@  unsigned long bitmap_find_next_zero_area(unsigned long *map,
                                          unsigned long nr,
                                          unsigned long align_mask);

+static inline unsigned long *bitmap_zero_extend(unsigned long *old,
+                                                long old_nbits, long new_nbits)
+{
+    long new_len = BITS_TO_LONGS(new_nbits) * sizeof(unsigned long);
+    unsigned long *new = g_realloc(old, new_len);
+    bitmap_clear(new, old_nbits, new_nbits - old_nbits);
+    return new;
+}
+
 #endif /* BITMAP_H */