diff options
Diffstat (limited to 'include/linux/find.h')
| -rw-r--r-- | include/linux/find.h | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/include/linux/find.h b/include/linux/find.h index 5e4f39ef2e72..28ec5a03393a 100644 --- a/include/linux/find.h +++ b/include/linux/find.h @@ -29,6 +29,8 @@ unsigned long __find_nth_and_andnot_bit(const unsigned long *addr1, const unsign unsigned long n); extern unsigned long _find_first_and_bit(const unsigned long *addr1, const unsigned long *addr2, unsigned long size); +unsigned long _find_first_and_and_bit(const unsigned long *addr1, const unsigned long *addr2, + const unsigned long *addr3, unsigned long size); extern unsigned long _find_first_zero_bit(const unsigned long *addr, unsigned long size); extern unsigned long _find_last_bit(const unsigned long *addr, unsigned long size); @@ -345,6 +347,31 @@ unsigned long find_first_and_bit(const unsigned long *addr1, } #endif +/** + * find_first_and_and_bit - find the first set bit in 3 memory regions + * @addr1: The first address to base the search on + * @addr2: The second address to base the search on + * @addr3: The third address to base the search on + * @size: The bitmap size in bits + * + * Returns the bit number for the first set bit + * If no bits are set, returns @size. + */ +static inline +unsigned long find_first_and_and_bit(const unsigned long *addr1, + const unsigned long *addr2, + const unsigned long *addr3, + unsigned long size) +{ + if (small_const_nbits(size)) { + unsigned long val = *addr1 & *addr2 & *addr3 & GENMASK(size - 1, 0); + + return val ? __ffs(val) : size; + } + + return _find_first_and_and_bit(addr1, addr2, addr3, size); +} + #ifndef find_first_zero_bit /** * find_first_zero_bit - find the first cleared bit in a memory region @@ -405,7 +432,7 @@ unsigned long find_next_and_bit_wrap(const unsigned long *addr1, { unsigned long bit = find_next_and_bit(addr1, addr2, size, offset); - if (bit < size) + if (bit < size || offset == 0) return bit; bit = find_first_and_bit(addr1, addr2, offset); @@ -413,8 +440,8 @@ unsigned long find_next_and_bit_wrap(const unsigned long *addr1, } /** - * find_next_bit_wrap - find the next set bit in both memory regions - * @addr: The first address to base the search on + * find_next_bit_wrap - find the next set bit in a memory region + * @addr: The address to base the search on * @size: The bitmap size in bits * @offset: The bitnumber to start searching at * @@ -427,7 +454,7 @@ unsigned long find_next_bit_wrap(const unsigned long *addr, { unsigned long bit = find_next_bit(addr, size, offset); - if (bit < size) + if (bit < size || offset == 0) return bit; bit = find_first_bit(addr, offset); |