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Some drivers use PAGE_SHARED, pgprot_writecombine()/pgprot_device(), add the defination to fix build error if NOMMU. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>