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Listing the set of host architectures does not scale. Depend instead on the existence of the architecture rng. This will allow RANDOM_TRUST_CPU to be selected on arm64. Today ARCH_RANDOM is only selected by x86, s390, and powerpc, so this does not adversely affect other architectures. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20200210130015.17664-5-mark.rutland@arm.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>