mm: page_alloc: use word-based accesses for get/set pageblock bitmaps

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index 5f2001a..49e930f 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1929,12 +1929,17 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
                     unsigned long address, unsigned int fault_flags)
 {
        struct vm_area_struct *vma;
+       vm_flags_t vm_flags;
        int ret;
 
        vma = find_extend_vma(mm, address);
        if (!vma || address < vma->vm_start)
                return -EFAULT;
 
+       vm_flags = (fault_flags & FAULT_FLAG_WRITE) ? VM_WRITE : VM_READ;
+       if (!(vm_flags & vma->vm_flags))
+               return -EFAULT;
+
        ret = handle_mm_fault(mm, vma, address, fault_flags);
        if (ret & VM_FAULT_ERROR) {
                if (ret & VM_FAULT_OOM)
@@ -3704,7 +3709,6 @@ static int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
        if (unlikely(is_vm_hugetlb_page(vma)))
                return hugetlb_fault(mm, vma, address, flags);
 
-retry:
        pgd = pgd_offset(mm, address);
        pud = pud_alloc(mm, pgd, address);
        if (!pud)
@@ -3742,20 +3746,13 @@ retry:
                        if (dirty && !pmd_write(orig_pmd)) {
                                ret = do_huge_pmd_wp_page(mm, vma, address, pmd,
                                                          orig_pmd);
-                               /*
-                                * If COW results in an oom, the huge pmd will
-                                * have been split, so retry the fault on the
-                                * pte for a smaller charge.
-                                */
-                               if (unlikely(ret & VM_FAULT_OOM))
-                                       goto retry;
-                               return ret;
+                               if (!(ret & VM_FAULT_FALLBACK))
+                                       return ret;
                        } else {
                                huge_pmd_set_accessed(mm, vma, address, pmd,
                                                      orig_pmd, dirty);
+                               return 0;
                        }
-
-                       return 0;
                }
        }