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Diffstat (limited to 'mm/msync.c')
-rw-r--r--mm/msync.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/mm/msync.c b/mm/msync.c
index 3b5f1c521d4..86039548606 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -25,6 +25,7 @@
static void msync_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end)
{
+ struct mm_struct *mm = vma->vm_mm;
pte_t *pte;
int progress = 0;
@@ -37,7 +38,7 @@ again:
if (progress >= 64) {
progress = 0;
if (need_resched() ||
- need_lockbreak(&vma->vm_mm->page_table_lock))
+ need_lockbreak(&mm->page_table_lock))
break;
}
progress++;
@@ -46,11 +47,11 @@ again:
if (!pte_maybe_dirty(*pte))
continue;
pfn = pte_pfn(*pte);
- if (!pfn_valid(pfn))
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, *pte, addr);
continue;
+ }
page = pfn_to_page(pfn);
- if (PageReserved(page))
- continue;
if (ptep_clear_flush_dirty(vma, addr, pte) ||
page_test_and_clear_dirty(page))
@@ -58,7 +59,7 @@ again:
progress += 3;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
- cond_resched_lock(&vma->vm_mm->page_table_lock);
+ cond_resched_lock(&mm->page_table_lock);
if (addr != end)
goto again;
}
@@ -102,8 +103,10 @@ static void msync_page_range(struct vm_area_struct *vma,
/* For hugepages we can't go walking the page table normally,
* but that's ok, hugetlbfs is memory based, so we don't need
- * to do anything more on an msync() */
- if (is_vm_hugetlb_page(vma))
+ * to do anything more on an msync().
+ * Can't do anything with VM_RESERVED regions either.
+ */
+ if (vma->vm_flags & (VM_HUGETLB|VM_RESERVED))
return;
BUG_ON(addr >= end);