x86: remove redundant pfn_pmd definition

[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / pgtable.h

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 06bbcbd66e9c508285020b65c6d411afd2bfe59b..a7dbb05075d2779d733399c0732883d73add5426 100644 (file)
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -437,6 +437,111 @@ static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
 # include "pgtable_64.h"
 #endif
 
+#ifndef __ASSEMBLY__
+#include <linux/mm_types.h>
+
+static inline int pte_none(pte_t pte)
+{
+       return !pte.pte;
+}
+
+#define __HAVE_ARCH_PTE_SAME
+static inline int pte_same(pte_t a, pte_t b)
+{
+       return a.pte == b.pte;
+}
+
+static inline int pte_present(pte_t a)
+{
+       return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
+}
+
+static inline int pmd_present(pmd_t pmd)
+{
+       return pmd_val(pmd) & _PAGE_PRESENT;
+}
+
+static inline int pmd_none(pmd_t pmd)
+{
+       /* Only check low word on 32-bit platforms, since it might be
+          out of sync with upper half. */
+       return !(unsigned long)native_pmd_val(pmd);
+}
+
+static inline unsigned long pmd_page_vaddr(pmd_t pmd)
+{
+       return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
+}
+
+static inline struct page *pmd_page(pmd_t pmd)
+{
+       return pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT);
+}
+
+/*
+ * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
+ *
+ * this macro returns the index of the entry in the pmd page which would
+ * control the given virtual address
+ */
+static inline unsigned pmd_index(unsigned long address)
+{
+       return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
+}
+
+#if PAGETABLE_LEVELS > 2
+static inline int pud_present(pud_t pud)
+{
+       return pud_val(pud) & _PAGE_PRESENT;
+}
+
+static inline unsigned long pud_page_vaddr(pud_t pud)
+{
+       return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
+}
+
+static inline struct page *pud_page(pud_t pud)
+{
+       return pfn_to_page(pud_val(pud) >> PAGE_SHIFT);
+}
+
+/* Find an entry in the second-level page table.. */
+static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
+{
+       return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
+}
+#endif /* PAGETABLE_LEVELS > 2 */
+
+#if PAGETABLE_LEVELS > 3
+static inline int pgd_present(pgd_t pgd)
+{
+       return pgd_val(pgd) & _PAGE_PRESENT;
+}
+
+static inline unsigned long pgd_page_vaddr(pgd_t pgd)
+{
+       return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
+}
+
+static inline struct page *pgd_page(pgd_t pgd)
+{
+       return pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT);
+}
+
+/* to find an entry in a page-table-directory. */
+static inline unsigned pud_index(unsigned long address)
+{
+       return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
+}
+
+static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
+{
+       return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
+}
+#endif /* PAGETABLE_LEVELS > 3 */
+
+#endif /* __ASSEMBLY__ */
+
 /*
  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
  *