arch/powerpc/mm/hugetlb: NestMMU workaround for hugetlb mprotect RW upgrade

[linux-2.6-block.git] / arch / powerpc / include / asm / book3s / 64 / pgtable.h

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index c9bfe526ca9df86c0f5b2aab8cbf063cd32ed81b..868fcaf56f6bf20425ae03d5fa42715cffa1c809 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -904,7 +904,7 @@ static inline int pud_none(pud_t pud)
 
 static inline int pud_present(pud_t pud)
 {
-       return (pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT));
+       return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT));
 }
 
 extern struct page *pud_page(pud_t pud);
@@ -951,7 +951,7 @@ static inline int pgd_none(pgd_t pgd)
 
 static inline int pgd_present(pgd_t pgd)
 {
-       return (pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT));
+       return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT));
 }
 
 static inline pte_t pgd_pte(pgd_t pgd)
@@ -1306,6 +1306,24 @@ static inline int pud_pfn(pud_t pud)
        BUILD_BUG();
        return 0;
 }
+#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
+pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *);
+void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long,
+                            pte_t *, pte_t, pte_t);
+
+/*
+ * Returns true for a R -> RW upgrade of pte
+ */
+static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_val)
+{
+       if (!(old_val & _PAGE_READ))
+               return false;
+
+       if ((!(old_val & _PAGE_WRITE)) && (new_val & _PAGE_WRITE))
+               return true;
+
+       return false;
+}
 
 #endif /* __ASSEMBLY__ */
 #endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */