mm, hwpoison: kill procs if unmap fails
If try_to_unmap() fails, the hwpoisoned page still resides in the address
space of some processes. We should kill these processes or the hwpoisoned
page might be consumed later. collect_procs() is always called to collect
relevant processes now so they can be killed later if unmap fails.
[linmiaohe@huawei.com: v2]
Link: https://lkml.kernel.org/r/20220823032346.4260-6-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220818130016.45313-6-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>