These 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 these warning will never be triggered.
Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
---
v2:
* remove another related warning as suggested by Mike Kravetz
---
mm/userfaultfd.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 01ad48621bb7..df11743f2196 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.
*/
@@ -262,7 +258,6 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
pte_t dst_pteval;
BUG_ON(dst_addr >= dst_start + len);
- VM_BUG_ON(dst_addr & (vma_hpagesize - 1));
/*
* Serialize via hugetlb_fault_mutex
--
2.17.1
