mm/sharepool: delete unused codes
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5QETC CVE: NA -------------------------------- sp_make_share_k2u only supports vmalloc address now. Therefore, delete a backup handle case. Also master is guaranteed not be freed until master->node_list is emptied. Signed-off-by: NGuo Mengqi <guomengqi3@huawei.com>
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