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a410656643
Make KASAN work with 5-level page-tables, including: 1. Implement and use __pgd_none() and kasan_p4d_offset(). 2. As done in kasan_pmd_populate() and kasan_pte_populate(), restrict the loop conditions of kasan_p4d_populate() and kasan_pud_populate() to avoid unnecessary population. Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>