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KVM: arm64: Convert kvm_mpidr_index() to bitmap_gather()

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Linux 6.9 has introduced new bitmap manipulation helpers, with
bitmap_gather() being of special interest, as it does exactly
what kvm_mpidr_index() is already doing.

Make the latter a wrapper around the former.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240502154247.3012042-1-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2024-05-02 16:42:47 +01:00
parent 03b3d00a70
commit 838d992b84
1 changed files with 3 additions and 13 deletions
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16
arch/arm64/include/asm/kvm_host.h
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@ -220,20 +220,10 @@ struct kvm_mpidr_data {
static inline u16 kvm_mpidr_index(struct kvm_mpidr_data *data, u64 mpidr)
{
unsigned long mask = data->mpidr_mask;
u64 aff = mpidr & MPIDR_HWID_BITMASK;
int nbits, bit, bit_idx = 0;
u16 index = 0;
unsigned long index = 0, mask = data->mpidr_mask;
unsigned long aff = mpidr & MPIDR_HWID_BITMASK;
/*
* If this looks like RISC-V's BEXT or x86's PEXT
* instructions, it isn't by accident.
*/
nbits = fls(mask);
for_each_set_bit(bit, &mask, nbits) {
index |= (aff & BIT(bit)) >> (bit - bit_idx);
bit_idx++;
}
bitmap_gather(&index, &aff, &mask, fls(mask));
return index;
}