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H A D | hugetlb.c | 9c8bbfac Fri Apr 29 16:36:58 CDT 2022 Baolin Wang <baolin.wang@linux.alibaba.com> 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 virtual>physical translation to exist for a virtual address. Thus add it.
Now no architectures enabling PMD sharing will be affected, since they do not have a VIVT cache. That means this issue can not be happened in practice so far.
Link: https://lkml.kernel.org/r/47441086affcabb6ecbe403173e9283b0d904b38.1650956489.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/419b0e777c9e6d1454dcd906e0f5b752a736d335.1650781755.git.baolin.wang@linux.alibaba.com Fixes: 6dfeaff93be1 ("hugetlb/userfaultfd: unshare all pmds for hugetlbfs when register wp") Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Peter Xu <peterx@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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