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ARM64_FEATURE_FIELD_BITS is set to 4 but not all ID register fields are 4 bits. See for instance ID_AA64SMFR0_EL1. The last user of this define, ARM64_FEATURE_FIELD_BITS, is the set_id_regs selftest. Its logic assumes the fields aren't a single bits; assert that's the case and stop using the define. As there are no more users, ARM64_FEATURE_FIELD_BITS is removed from the arm64 tools sysreg.h header. A separate commit removes this from the kernel version of the header. Signed-off-by: Ben Horgan <ben.horgan@arm.com> Acked-by: Marc Zyngier <maz@kernel.org> Acked-by: Oliver Upton <oupton@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>