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Although we've had signed values for some features such as PMUv3 and FP, the code that handles the comparaison with some limit has a couple of annoying issues: - the min_field_value is always unsigned, meaning that we cannot easily compare it with a negative value - it is not possible to have a range of values, let alone a range of negative values Fix this by: - adding an upper limit to the comparison, defaulting to all bits being set to the maximum positive value - ensuring that the signess of the min and max values are taken into account A ARM64_CPUID_FIELDS_NEG() macro is provided for signed features, but nothing is using it yet. Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Link: https://lore.kernel.org/r/20240122181344.258974-3-maz@kernel.org Signed-off-by: Oliver Upton <oliver.upton@linux.dev>