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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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11
include/sbi/sbi_hartmask.h
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@@ -181,6 +181,17 @@ static inline void sbi_hartmask_xor(struct sbi_hartmask *dstp,
sbi_hartmask_bits(src2p), SBI_HARTMASK_MAX_BITS);
}
/**
* Count of bits in *srcp
* @param srcp the hartmask to count bits in
*
* Return: count of bits set in *srcp
*/
static inline int sbi_hartmask_weight(const struct sbi_hartmask *srcp)
{
return bitmap_weight(sbi_hartmask_bits(srcp), SBI_HARTMASK_MAX_BITS);
}
/**
* Iterate over each HART index in hartmask
* __i hart index