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cpumask: add cpumask_weight_andnot()

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Similarly to cpumask_weight_and(), cpumask_weight_andnot() is a handy
helper that may help to avoid creating an intermediate mask just to
calculate number of bits that set in a 1st given mask, and clear in 2nd
one.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Yury Norov
2024-01-28 22:21:04 -08:00
committed by Paolo Abeni
parent 3723b56d6f
commit c1f5204efc
3 changed files with 32 additions and 0 deletions
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include/linux/bitmap.h
+12
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@@ -54,6 +54,7 @@ struct device;
* bitmap_full(src, nbits) Are all bits set in *src?
* bitmap_weight(src, nbits) Hamming Weight: number set bits
* bitmap_weight_and(src1, src2, nbits) Hamming Weight of and'ed bitmap
* bitmap_weight_andnot(src1, src2, nbits) Hamming Weight of andnot'ed bitmap
* bitmap_set(dst, pos, nbits) Set specified bit area
* bitmap_clear(dst, pos, nbits) Clear specified bit area
* bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area
@@ -169,6 +170,8 @@ bool __bitmap_subset(const unsigned long *bitmap1,
unsigned int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits);
unsigned int __bitmap_weight_and(const unsigned long *bitmap1,
const unsigned long *bitmap2, unsigned int nbits);
unsigned int __bitmap_weight_andnot(const unsigned long *bitmap1,
const unsigned long *bitmap2, unsigned int nbits);
void __bitmap_set(unsigned long *map, unsigned int start, int len);
void __bitmap_clear(unsigned long *map, unsigned int start, int len);
@@ -425,6 +428,15 @@ unsigned long bitmap_weight_and(const unsigned long *src1,
return __bitmap_weight_and(src1, src2, nbits);
}
static __always_inline
unsigned long bitmap_weight_andnot(const unsigned long *src1,
const unsigned long *src2, unsigned int nbits)
{
if (small_const_nbits(nbits))
return hweight_long(*src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits));
return __bitmap_weight_andnot(src1, src2, nbits);
}
static __always_inline void bitmap_set(unsigned long *map, unsigned int start,
unsigned int nbits)
{