* Liang Li (liang.z.li@xxxxxxxxx) wrote:
> Sometimes, it is need to move a portion of bitmap to another place
> in a large bitmap, if overlap happens, the bitmap_copy can't not
> work correctly, we need a new function to do this work.
>
> Signed-off-by: Liang Li <liang.z.li@xxxxxxxxx>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
> ---
> include/qemu/bitmap.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h
> index ec5146f..6ac89ca 100644
> --- a/include/qemu/bitmap.h
> +++ b/include/qemu/bitmap.h
> @@ -37,6 +37,7 @@
> * bitmap_set(dst, pos, nbits) Set specified bit area
> * bitmap_set_atomic(dst, pos, nbits) Set specified bit area with atomic ops
> * bitmap_clear(dst, pos, nbits) Clear specified bit area
> + * bitmap_move(dst, src, nbits) Move *src to *dst
> * bitmap_test_and_clear_atomic(dst, pos, nbits) Test and clear area
> * bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area
> */
> @@ -136,6 +137,18 @@ static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
> }
> }
>
> +static inline void bitmap_move(unsigned long *dst, const unsigned long *src,
> + long nbits)
> +{
> + if (small_nbits(nbits)) {
> + unsigned long tmp = *src;
> + *dst = tmp;
> + } else {
> + long len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
> + memmove(dst, src, len);
> + }
> +}
> +
> static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
> const unsigned long *src2, long nbits)
> {
> --
> 1.9.1
>
--
Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
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