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-rw-r--r--mm/memory.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 9b3b73f4ae9..b6e5fd23cc5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2792,24 +2792,23 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
spinlock_t *ptl;
pte_t entry;
- if (check_stack_guard_page(vma, address) < 0) {
- pte_unmap(page_table);
+ pte_unmap(page_table);
+
+ /* Check if we need to add a guard page to the stack */
+ if (check_stack_guard_page(vma, address) < 0)
return VM_FAULT_SIGBUS;
- }
+ /* Use the zero-page for reads */
if (!(flags & FAULT_FLAG_WRITE)) {
entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
vma->vm_page_prot));
- ptl = pte_lockptr(mm, pmd);
- spin_lock(ptl);
+ page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
if (!pte_none(*page_table))
goto unlock;
goto setpte;
}
/* Allocate our own private page. */
- pte_unmap(page_table);
-
if (unlikely(anon_vma_prepare(vma)))
goto oom;
page = alloc_zeroed_user_highpage_movable(vma, address);