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mm: hugetlb_vmemmap: add missing smp_wmb() before set_pte_at()

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The memory barrier smp_wmb() is needed to make sure that preceding stores
to the page contents become visible before the below set_pte_at() write.

Link: https://lkml.kernel.org/r/20220816130553.31406-5-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-08-16 21:05:51 +08:00 committed by Andrew Morton
parent 3a5497a2da
commit 939de63d35
1 changed files with 5 additions and 0 deletions
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5
mm/hugetlb_vmemmap.c
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@ -287,6 +287,11 @@ static void vmemmap_restore_pte(pte_t *pte, unsigned long addr,
copy_page(to, (void *)walk->reuse_addr);
reset_struct_pages(to);
/*
* Makes sure that preceding stores to the page contents become visible
* before the set_pte_at() write.
*/
smp_wmb();
set_pte_at(&init_mm, addr, pte, mk_pte(page, pgprot));
}