arm64/sme: Implement vector length configuration prctl()s
As for SVE provide a prctl() interface which allows processes to configure their SME vector length. Signed-off-by: NMark Brown <broonie@kernel.org> Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20220419112247.711548-12-broonie@kernel.orgSigned-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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