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-rw-r--r--lib/bitmap.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index f9e834841e94..4250519d7d1c 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -222,6 +222,18 @@ int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
}
EXPORT_SYMBOL(__bitmap_andnot);
+void __bitmap_replace(unsigned long *dst,
+ const unsigned long *old, const unsigned long *new,
+ const unsigned long *mask, unsigned int nbits)
+{
+ unsigned int k;
+ unsigned int nr = BITS_TO_LONGS(nbits);
+
+ for (k = 0; k < nr; k++)
+ dst[k] = (old[k] & ~mask[k]) | (new[k] & mask[k]);
+}
+EXPORT_SYMBOL(__bitmap_replace);
+
int __bitmap_intersects(const unsigned long *bitmap1,
const unsigned long *bitmap2, unsigned int bits)
{