The quilt patch titled
Subject: mm: hugetlb: add missing cache flushing in hugetlb_unshare_all_pmds()
has been removed from the -mm tree. Its filename was
mm-hugetlb-add-missing-cache-flushing-in-hugetlb_unshare_all_pmds.patch
This patch was dropped because it was merged into mm-stable
------------------------------------------------------
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 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@xxxxxxxxxxxxxxxxx
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>
Reviewed-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@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
@@ -6886,6 +6886,7 @@ 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
