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mm/hugetlb: use hugetlb_pte_stable in migration race check 

After hugetlb_pte_stable() introduced, we can also rewrite the migration
race condition against page allocation to use the new helper too.

Link: https://lkml.kernel.org/r/20221004193400.110155-3-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peter Xu 2022-10-04 15:33:59 -04:00 committed by Andrew Morton
parent 2ea7ff1e39
commit f9bf6c03ec
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
mm/hugetlb.c
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@ -5634,11 +5634,10 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
* here. Before returning error, get ptl and make
* sure there really is no pte entry.
*/
ptl = huge_pte_lock(h, mm, ptep);
ret = 0;
if (huge_pte_none(huge_ptep_get(ptep)))
if (hugetlb_pte_stable(h, mm, ptep, old_pte))
ret = vmf_error(PTR_ERR(page));
spin_unlock(ptl);
else
ret = 0;
goto out;
}
clear_huge_page(page, address, pages_per_huge_page(h));