percpu: convert flexible array initializers to use struct_size()
Use the safer macro as sparked by the long discussion in [1]. [1] https://lore.kernel.org/lkml/20200917204514.GA2880159@google.com/ Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Dennis Zhou <dennis@kernel.org>
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