libxc: add bitmap_clear function

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Committed-by: Ian Jackson <ian.jackson.citrix.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/libxc/xc_bitops.h b/tools/libxc/xc_bitops.h
index 8ee2aab95f..274d8c8b0e 100644
--- a/tools/libxc/xc_bitops.h
+++ b/tools/libxc/xc_bitops.h
@@ -4,6 +4,7 @@
 /* bitmap operations for single threaded access */
 
 #include <stdlib.h>
+#include <string.h>
 
 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
 #define ORDER_LONG (sizeof(unsigned long) == 4 ? 5 : 6)
@@ -25,6 +26,11 @@ static inline unsigned long *bitmap_alloc(int nr_bits)
     return calloc(1, bitmap_size(nr_bits));
 }
 
+static inline void bitmap_clear(unsigned long *addr, int nr_bits)
+{
+    memset(addr, 0, bitmap_size(nr_bits));
+}
+
 static inline int test_bit(int nr, volatile unsigned long *addr)
 {
     return (BITMAP_ENTRY(nr, addr) >> BITMAP_SHIFT(nr)) & 1;