diff options
| author | Stefano Brivio <sbrivio@redhat.com> | 2020-01-22 00:17:54 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-01-27 08:54:30 +0100 |
| commit | 2092767168f0681aa03727448b801600a364c013 (patch) | |
| tree | 07fa49e6476d91c6a9b453ec740039ebe8eb9a80 /include | |
| parent | f3a2181e16f1dcbf5446ed43f6b5d9f56c459f85 (diff) | |
bitmap: Introduce bitmap_cut(): cut bits and shift remaining
The new bitmap function bitmap_cut() copies bits from source to
destination by removing the region specified by parameters first
and cut, and remapping the bits above the cut region by right
shifting them.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bitmap.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index ff335b22f23c..f0f3a9fffa6a 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -53,6 +53,7 @@ * bitmap_find_next_zero_area_off(buf, len, pos, n, mask) as above * bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n * bitmap_shift_left(dst, src, n, nbits) *dst = *src << n + * bitmap_cut(dst, src, first, n, nbits) Cut n bits from first, copy rest * bitmap_replace(dst, old, new, mask, nbits) *dst = (*old & ~(*mask)) | (*new & *mask) * bitmap_remap(dst, src, old, new, nbits) *dst = map(old, new)(src) * bitmap_bitremap(oldbit, old, new, nbits) newbit = map(old, new)(oldbit) @@ -133,6 +134,9 @@ extern void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, unsigned int shift, unsigned int nbits); extern void __bitmap_shift_left(unsigned long *dst, const unsigned long *src, unsigned int shift, unsigned int nbits); +extern void bitmap_cut(unsigned long *dst, const unsigned long *src, + unsigned int first, unsigned int cut, + unsigned int nbits); extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, unsigned int nbits); extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, |