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The function executes a CBEQ instruction which is valid if the CPU supports the CMPBR extension. The CBEQ branches to skip the following UDF instruction, and no SIGILL is generated. Otherwise, it will generate a SIGILL. Signed-off-by: Yifan Wu <wuyifan50@huawei.com> Reviewed-by: Mark Brown <broonie@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>