mm: fix the handling Non-LRU pages returned by follow_page

The handling Non-LRU pages returned by follow_page() jumps directly, it
doesn't call put_page() to handle the reference count, since 'FOLL_GET'
flag for follow_page() has get_page() called.  Fix the zone device page
check by handling the page reference count correctly before returning.

And as David reviewed, "device pages are never PageKsm pages".  Drop this
zone device page check for break_ksm().

Since the zone device page can't be a transparent huge page, so drop the
redundant zone device page check for split_huge_pages_pid().  (by Miaohe)

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 3218f8712d6b ("mm: handling Non-LRU pages returned by vm_normal_pages")
Signed-off-by: Haiyue Wang <[email protected]>
Reviewed-by: "Huang, Ying" <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
Reviewed-by: Alistair Popple <[email protected]>
Reviewed-by: Miaohe Lin <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Alex Sierra <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Muchun Song <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions