diff options
Diffstat (limited to 'include/asm-s390')
| -rw-r--r-- | include/asm-s390/bitops.h | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/include/asm-s390/bitops.h b/include/asm-s390/bitops.h index 95d93955a9b..882db054110 100644 --- a/include/asm-s390/bitops.h +++ b/include/asm-s390/bitops.h @@ -790,8 +790,6 @@ static inline int sched_find_first_bit(unsigned long *b) test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr) #define ext2_test_bit(nr, addr) \ test_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr) -#define ext2_find_next_bit(addr, size, off) \ - generic_find_next_le_bit((unsigned long *)(addr), (size), (off)) static inline int ext2_find_first_zero_bit(void *vaddr, unsigned int size) { @@ -833,6 +831,47 @@ static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size, return offset + ext2_find_first_zero_bit(p, size); } +static inline unsigned long ext2_find_first_bit(void *vaddr, + unsigned long size) +{ + unsigned long bytes, bits; + + if (!size) + return 0; + bytes = __ffs_word_loop(vaddr, size); + bits = __ffs_word(bytes*8, __load_ulong_le(vaddr, bytes)); + return (bits < size) ? bits : size; +} + +static inline int ext2_find_next_bit(void *vaddr, unsigned long size, + unsigned long offset) +{ + unsigned long *addr = vaddr, *p; + unsigned long bit, set; + + if (offset >= size) + return size; + bit = offset & (__BITOPS_WORDSIZE - 1); + offset -= bit; + size -= offset; + p = addr + offset / __BITOPS_WORDSIZE; + if (bit) { + /* + * s390 version of ffz returns __BITOPS_WORDSIZE + * if no zero bit is present in the word. + */ + set = ffs(__load_ulong_le(p, 0) >> bit) + bit; + if (set >= size) + return size + offset; + if (set < __BITOPS_WORDSIZE) + return set + offset; + offset += __BITOPS_WORDSIZE; + size -= __BITOPS_WORDSIZE; + p++; + } + return offset + ext2_find_first_bit(p, size); +} + #include <asm-generic/bitops/minix.h> #endif /* __KERNEL__ */ |