The patch titled
Subject: mm: hugetlb: add missing cache flushing in hugetlb_unshare_all_pmds()
has been added to the -mm tree. Its filename is
mm-hugetlb-add-missing-cache-flushing-in-hugetlb_unshare_all_pmds.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-add-missing-cache-flushing-in-hugetlb_unshare_all_pmds.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-add-missing-cache-flushing-in-hugetlb_unshare_all_pmds.patch
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------------------------------------------------------
From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: hugetlb: add missing cache flushing in hugetlb_unshare_all_pmds()
Missed calling flush_cache_range() before removing the sharing PMD
entrires, otherwise data consistence issue may be occurred on some
architectures whose caches are strict and require a virtualâ??>physical
translation to exist for a virtual address. Thus add it.
Link: https://lkml.kernel.org/r/419b0e777c9e6d1454dcd906e0f5b752a736d335.1650781755.git.baolin.wang@xxxxxxxxxxxxxxxxx
Fixes: 6dfeaff93be1 ("hugetlb/userfaultfd: unshare all pmds for hugetlbfs when register wp")
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/hugetlb.c~mm-hugetlb-add-missing-cache-flushing-in-hugetlb_unshare_all_pmds
+++ a/mm/hugetlb.c
@@ -6941,6 +6941,7 @@ void hugetlb_unshare_all_pmds(struct vm_
if (start >= end)
return;
+ flush_cache_range(vma, start, end);
/*
* No need to call adjust_range_if_pmd_sharing_possible(), because
* we have already done the PUD_SIZE alignment.
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
mm-hugetlb-add-missing-cache-flushing-in-hugetlb_unshare_all_pmds.patch
mm-migrate-simplify-the-refcount-validation-when-migrating-hugetlb-mapping.patch
