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mm: generalize PMD page table allocation
The generic PMD allocator assumes order-0 page tables and zero-valued empty entries. MIPS and LoongArch need pmd_init() to install their invalid entries, while MIPS and parisc use PMD_TABLE_ORDER to d
The generic PMD allocator assumes order-0 page tables and zero-valued empty entries. MIPS and LoongArch need pmd_init() to install their invalid entries, while MIPS and parisc use PMD_TABLE_ORDER to d