mm: ksm: support hwpoison for ksm page

hwpoison_user_mappings() is updated to support ksm pages, and add
collect_procs_ksm() to collect processes when the error hit an ksm page. 
The difference from collect_procs_anon() is that it also needs to traverse
the rmap-item list on the stable node of the ksm page.  At the same time,
add_to_kill_ksm() is added to handle ksm pages.  And
task_in_to_kill_list() is added to avoid duplicate addition of tsk to the
to_kill list.  This is because when scanning the list, if the pages that
make up the ksm page all come from the same process, they may be added
repeatedly.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Longlong Xia <[email protected]>
Tested-by: Naoya Horiguchi <[email protected]>
Reviewed-by: Kefeng Wang <[email protected]>
Cc: Miaohe Lin <[email protected]>
Cc: Nanyong Sun <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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