The warning here is to make sure address(dst_addr) and length(len -
copied) are huge page size aligned.
While this is ensured by:
dst_start and len is huge page size aligned
dst_addr equals to dst_start and increase huge page size each time
copied increase huge page size each time
This means this warning will never be triggered.
Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
---
mm/userfaultfd.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index c7ae74ce5ff3..7895c715000e 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -243,10 +243,6 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
vm_shared = dst_vma->vm_flags & VM_SHARED;
}
- if (WARN_ON(dst_addr & (vma_hpagesize - 1) ||
- (len - copied) & (vma_hpagesize - 1)))
- goto out_unlock;
-
/*
* If not shared, ensure the dst_vma has a anon_vma.
*/
--
2.17.1
