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This gets referred to a lot in commit messages, so let's pull it into the selftests. Almost vanilla from: http://ozlabs.org/~anton/junkcode/context_switch2.c Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Anton Blanchard <anton@samba.org>