Most file-backed faults are already handled through ->map_pages(),
but if we need to do I/O we'll come this way. Since filemap_fault()
is now safe to be called under the VMA lock, we can handle these faults
under the VMA lock now.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
mm/memory.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 02231a9394ed..5f92126dc527 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4617,10 +4617,9 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf)
return ret;
}
- if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
- vma_end_read(vmf->vma);
- return VM_FAULT_RETRY;
- }
+ ret = vmf_maybe_unlock_vma(vmf);
+ if (ret)
+ return ret;
ret = __do_fault(vmf);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
--
2.40.1
