diff options
Diffstat (limited to 'arch/powerpc/mm/pgtable-book3s64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable-book3s64.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c index ecd31569a120..e7da590c7a78 100644 --- a/arch/powerpc/mm/pgtable-book3s64.c +++ b/arch/powerpc/mm/pgtable-book3s64.c @@ -401,6 +401,31 @@ void arch_report_meminfo(struct seq_file *m) } #endif /* CONFIG_PROC_FS */ +pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, + pte_t *ptep) +{ + unsigned long pte_val; + + /* + * Clear the _PAGE_PRESENT so that no hardware parallel update is + * possible. Also keep the pte_present true so that we don't take + * wrong fault. + */ + pte_val = pte_update(vma->vm_mm, addr, ptep, _PAGE_PRESENT, _PAGE_INVALID, 0); + + return __pte(pte_val); + +} + +void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, + pte_t *ptep, pte_t old_pte, pte_t pte) +{ + if (radix_enabled()) + return radix__ptep_modify_prot_commit(vma, addr, + ptep, old_pte, pte); + set_pte_at(vma->vm_mm, addr, ptep, pte); +} + /* * For hash translation mode, we use the deposited table to store hash slot * information and they are stored at PTRS_PER_PMD offset from related pmd |