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On older CPUs the switch_endian() syscall doesn't work. Currently that causes the switch_endian_test to just crash. Instead detect the failure and properly exit with a failure message. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200819015727.1977134-9-mpe@ellerman.id.au