mm_types: add virtual and _last_cpupid into struct folio

Patch series "mm: convert page cpupid functions to folios", v3.

The cpupid(or access time) used by numa balancing is stored in flags or
_last_cpupid(if LAST_CPUPID_NOT_IN_PAGE_FLAGS) of page, this is to convert
page cpupid to folio cpupid, a new _last_cpupid is added into folio, which
make us to use folio->_last_cpupid directly, and the page cpupid functions
are converted to folio ones.

  page_cpupid_last()		-> folio_last_cpupid()
  xchg_page_access_time()	-> folio_xchg_access_time()
  page_cpupid_xchg_last()	-> folio_xchg_last_cpupid()


This patch (of 19):

If WANT_PAGE_VIRTUAL and LAST_CPUPID_NOT_IN_PAGE_FLAGS defined, the
'virtual' and '_last_cpupid' are in struct page, and since _last_cpupid is
used by numa balancing feature, it is better to move it before KMSAN
metadata from struct page, also add them into struct folio to make us to
access them from folio directly.

Link: https://lkml.kernel.org/r/20231018140806.2783514-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20231018140806.2783514-2-wangkefeng.wang@huawei.com


Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>