Change the fault handler to operate with a fine grained range lock when
operating on any of the explicitly supported file types.
Signed-off-by: Michel Lespinasse <walken@xxxxxxxxxx>
---
arch/x86/mm/fault.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git arch/x86/mm/fault.c arch/x86/mm/fault.c
index 1e37284d373c..ca30952896e1 100644
--- arch/x86/mm/fault.c
+++ arch/x86/mm/fault.c
@@ -1456,9 +1456,9 @@ void do_user_addr_fault(struct pt_regs *regs,
/*
* Fall back to locking the entire MM
- * when operating on file vma.
+ * when the vm_ops do not support fine grained range locking.
*/
- if (!vma_is_anonymous(vma)) {
+ if (!vma_is_anonymous(vma) && !vma->vm_ops->fine_grained) {
mm_read_range_unlock(mm, range);
range = mm_coarse_lock_range();
goto retry;
--
2.25.0.341.g760bfbb309-goog
