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On LoongArch system, there is only one page needed for zero page (no cache synonyms), and there is no COLOR_ZERO_PAGE, so zero_page_mask is useless and the macro __HAVE_COLOR_ZERO_PAGE is not necessary. Like other popular architectures, It is simpler to define the zero page in kernel BSS code segment rather than dynamically allocate. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>