mm: ZERO_PAGE without PTE_SPECIAL

[linux-block.git] / arch / mips / include / asm / pgtable.h

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 6a0edf72ffbc1aeaa2f039bdf6849eda7eebe511..d6eb6134abeca4f819427937c9ad3dee380d1360 100644 (file)
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -76,6 +76,16 @@ extern unsigned long zero_page_mask;
 #define ZERO_PAGE(vaddr) \
        (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
 
+#define is_zero_pfn is_zero_pfn
+static inline int is_zero_pfn(unsigned long pfn)
+{
+       extern unsigned long zero_pfn;
+       unsigned long offset_from_zero_pfn = pfn - zero_pfn;
+       return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
+}
+
+#define my_zero_pfn(addr)      page_to_pfn(ZERO_PAGE(addr))
+
 extern void paging_init(void);
 
 /*
@@ -292,6 +302,16 @@ static inline pte_t pte_mkyoung(pte_t pte)
                pte_val(pte) |= _PAGE_SILENT_READ;
        return pte;
 }
+
+#ifdef _PAGE_HUGE
+static inline int pte_huge(pte_t pte)  { return pte_val(pte) & _PAGE_HUGE; }
+
+static inline pte_t pte_mkhuge(pte_t pte)
+{
+       pte_val(pte) |= _PAGE_HUGE;
+       return pte;
+}
+#endif /* _PAGE_HUGE */
 #endif
 static inline int pte_special(pte_t pte)       { return 0; }
 static inline pte_t pte_mkspecial(pte_t pte)   { return pte; }