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...@intel.com> --- 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