diff options
Diffstat (limited to 'lib/hweight.c')
| -rw-r--r-- | lib/hweight.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/hweight.c b/lib/hweight.c index b7d81ba143d1..0dfcafc3fd39 100644 --- a/lib/hweight.c +++ b/lib/hweight.c @@ -1,17 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0 #include <linux/export.h> #include <linux/bitops.h> #include <asm/types.h> /** - * hweightN - returns the hamming weight of a N-bit word - * @x: the word to weigh + * DOC: __sw_hweightN - returns the hamming weight of a N-bit word + * @w: the word to weigh * * The Hamming Weight of a number is the total number of bits set in it. */ unsigned int __sw_hweight32(unsigned int w) { -#ifdef ARCH_HAS_FAST_MULTIPLIER +#ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER w -= (w >> 1) & 0x55555555; w = (w & 0x33333333) + ((w >> 2) & 0x33333333); w = (w + (w >> 4)) & 0x0f0f0f0f; @@ -49,7 +50,7 @@ unsigned long __sw_hweight64(__u64 w) return __sw_hweight32((unsigned int)(w >> 32)) + __sw_hweight32((unsigned int)w); #elif BITS_PER_LONG == 64 -#ifdef ARCH_HAS_FAST_MULTIPLIER +#ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER w -= (w >> 1) & 0x5555555555555555ul; w = (w & 0x3333333333333333ul) + ((w >> 2) & 0x3333333333333333ul); w = (w + (w >> 4)) & 0x0f0f0f0f0f0f0f0ful; |