add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/nds32/mm/proc.c
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@@ -5,7 +5,6 @@
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 #include <linux/sched.h>
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 #include <linux/mm.h>
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 #include <asm/nds32.h>
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-#include <asm/pgtable.h>
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 #include <asm/tlbflush.h>
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 #include <asm/cacheflush.h>
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 #include <asm/l2_cache.h>
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@@ -19,7 +18,7 @@
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 	pmd_t *pmd;
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 	pte_t *ptep, pte;
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-	pmd = pmd_offset(pgd_offset_k(addr), addr);
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+	pmd = pmd_off_k(addr);
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 	if (!pmd_none(*pmd)) {
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 		ptep = pte_offset_map(pmd, addr);
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 		pte = *ptep;
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@@ -32,20 +31,24 @@
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 pte_t va_present(struct mm_struct * mm, unsigned long addr)
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 {
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 	pgd_t *pgd;
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+	p4d_t *p4d;
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 	pud_t *pud;
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 	pmd_t *pmd;
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 	pte_t *ptep, pte;
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 	pgd = pgd_offset(mm, addr);
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 	if (!pgd_none(*pgd)) {
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-		pud = pud_offset(pgd, addr);
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-		if (!pud_none(*pud)) {
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-			pmd = pmd_offset(pud, addr);
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-			if (!pmd_none(*pmd)) {
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-				ptep = pte_offset_map(pmd, addr);
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-				pte = *ptep;
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-				if (pte_present(pte))
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-					return pte;
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+		p4d = p4d_offset(pgd, addr);
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+		if (!p4d_none(*p4d)) {
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+			pud = pud_offset(p4d, addr);
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+			if (!pud_none(*pud)) {
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+				pmd = pmd_offset(pud, addr);
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+				if (!pmd_none(*pmd)) {
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+					ptep = pte_offset_map(pmd, addr);
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+					pte = *ptep;
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+					if (pte_present(pte))
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+						return pte;
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+				}
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 			}
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 		}
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 	}