From: YangHui <yanghui.def@xxxxxxxxx>
if pte_alloc_one failed alloc a page, do_fault_around will return 0.
and it will come into __do_fault(), it also pte_alloc_one a page.
in __do_fault and do_fault_around, pte_alloc_one did the same thing,
if do_fault_around alloc page filed,we just let it return. there is
no need to come into __do_fault to do repetitive pte_alloc_one.
Signed-off-by: YangHui <yanghui.def@xxxxxxxxx>
---
mm/memory.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c
index f703fe8..a2d50a9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3799,8 +3799,10 @@ static vm_fault_t do_fault_around(struct vm_fault *vmf)
if (pmd_none(*vmf->pmd)) {
vmf->prealloc_pte = pte_alloc_one(vmf->vma->vm_mm);
- if (!vmf->prealloc_pte)
+ if (!vmf->prealloc_pte) {
+ ret = VM_FAULT_OOM;
goto out;
+ }
smp_wmb(); /* See comment in __pte_alloc() */
}
--
2.7.4
