hulk inclusion
category: perf
bugzilla: 18689
CVE: CVE

This reverts commit adb03115.

1) This perious patch introduce performance regression,
MySQL performance is reduced by 40% in vm.

2) The previous patch did not resolve the overflow problem,
it just ignore the UBSAN warning.

So, the patch dit not resolve real problem, but introduce
significant performance regression. Just revert it.

https://lkml.org/lkml/2019/7/24/243
https://lore.kernel.org/lkml/b0160f4b-b996-b0ee-405a-3d5f1866272e@gmail.com/
https://lore.kernel.org/lkml/20181101172739.GA3196@hirez.programming.kicks-ass.net/

Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Yongjun Wei <weiyongjun1@huawei.com>
Cc: Xuefeng Wang <wxf.wang@hisilicon.com>
Tested-by: NChen Tongbiao <chentongbiao@huawei.com>
Signed-off-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Reviewed-by: NMao Wenan <maowenan@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>