| Message ID | 1468550849-22172-8-git-send-email-liang.z.li@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
* Liang Li (liang.z.li@intel.com) 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@intel.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.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 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
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) {
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@intel.com> --- include/qemu/bitmap.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)