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sbi: Introduce sbi_hartmask_weight

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Provide a function to count the number of set bits in a hartmask,
which builds on a new function for the same that operates on a
bitmask. While at it, improve the performance of sbi_popcount()
which is used in the implementation.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250314163021.154530-5-ajones@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones
2025-03-14 17:30:23 +01:00
committed by Anup Patel
parent 2142618f12
commit a6e5f8878c
3 changed files with 39 additions and 7 deletions
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13
include/sbi/sbi_bitmap.h
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@@ -130,4 +130,17 @@ static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
__bitmap_xor(dst, src1, src2, nbits);
}
static inline int bitmap_weight(const unsigned long *src, int nbits)
{
int i, res = 0;
for (i = 0; i < nbits / BITS_PER_LONG; i++)
res += sbi_popcount(src[i]);
if (nbits % BITS_PER_LONG)
res += sbi_popcount(src[i] & BITMAP_LAST_WORD_MASK(nbits));
return res;
}
#endif