diff options
| -rw-r--r-- | include/linux/find.h | 23 | ||||
| -rw-r--r-- | lib/find_bit.c | 16 |
2 files changed, 34 insertions, 5 deletions
diff --git a/include/linux/find.h b/include/linux/find.h index 424ef67d4a42..2464bff5de04 100644 --- a/include/linux/find.h +++ b/include/linux/find.h @@ -17,6 +17,10 @@ extern unsigned long _find_first_and_bit(const unsigned long *addr1, 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); +#ifdef __BIG_ENDIAN +unsigned long _find_first_zero_bit_le(const unsigned long *addr, unsigned long size); +#endif + #ifndef find_next_bit /** * find_next_bit - find the next set bit in a memory region @@ -251,6 +255,20 @@ unsigned long find_next_zero_bit_le(const void *addr, unsigned } #endif +#ifndef find_first_zero_bit_le +static inline +unsigned long find_first_zero_bit_le(const void *addr, unsigned long size) +{ + if (small_const_nbits(size)) { + unsigned long val = swab(*(const unsigned long *)addr) | ~GENMASK(size - 1, 0); + + return val == ~0UL ? size : ffz(val); + } + + return _find_first_zero_bit_le(addr, size); +} +#endif + #ifndef find_next_bit_le static inline unsigned long find_next_bit_le(const void *addr, unsigned @@ -270,11 +288,6 @@ unsigned long find_next_bit_le(const void *addr, unsigned } #endif -#ifndef find_first_zero_bit_le -#define find_first_zero_bit_le(addr, size) \ - find_next_zero_bit_le((addr), (size), 0) -#endif - #else #error "Please fix <asm/byteorder.h>" #endif diff --git a/lib/find_bit.c b/lib/find_bit.c index 894b656f6836..61ec2992938b 100644 --- a/lib/find_bit.c +++ b/lib/find_bit.c @@ -160,3 +160,19 @@ unsigned long find_next_clump8(unsigned long *clump, const unsigned long *addr, return offset; } EXPORT_SYMBOL(find_next_clump8); + +#ifdef __BIG_ENDIAN + +#ifndef find_first_zero_bit_le +/* + * Find the first cleared bit in an LE memory region. + */ +unsigned long _find_first_zero_bit_le(const unsigned long *addr, unsigned long size) +{ + return FIND_FIRST_BIT(~addr[idx], swab, size); +} +EXPORT_SYMBOL(_find_first_zero_bit_le); + +#endif + +#endif /* __BIG_ENDIAN */ |