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>
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));
}