Messages in this thread Patch in this message | | | From | Miaohe Lin <> | Subject | [PATCH 4/6] mm: hugetlb_vmemmap: add missing smp_wmb() before set_pte_at() | Date | Tue, 16 Aug 2022 21:05:51 +0800 |
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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.
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> --- mm/hugetlb_vmemmap.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 20f414c0379f..76b2d03a0d8d 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -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)); } -- 2.23.0
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