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authorMiaohe Lin <linmiaohe@huawei.com>2022-08-16 21:05:51 +0800
committerAndrew Morton <akpm@linux-foundation.org>2022-09-11 20:25:55 -0700
commit939de63d35dde45dbc10bd21f174f86629fbe78d (patch)
treeb890e34e225c78f4a4c0110995fd43508dc0628f /mm/hugetlb_vmemmap.c
parent3a5497a2dae381cb1b201fb20847fb32a059da25 (diff)
mm: hugetlb_vmemmap: add missing smp_wmb() before set_pte_at()
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>
Diffstat (limited to 'mm/hugetlb_vmemmap.c')
-rw-r--r--mm/hugetlb_vmemmap.c5
1 files changed, 5 insertions, 0 deletions
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));
}