add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/include/asm-generic/pgtable-nopmd.h
..
..
@@ -51,7 +51,7 @@
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 #define __pmd(x)				((pmd_t) { __pud(x) } )
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 #define pud_page(pud)				(pmd_page((pmd_t){ pud }))
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-#define pud_page_vaddr(pud)			(pmd_page_vaddr((pmd_t){ pud }))
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+#define pud_pgtable(pud)			((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
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 /*
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  * allocating and freeing a pmd is trivial: the 1-entry pmd is