mm/ksm: remove page_mapcount() usage in stable_tree_search()

We want to limit the use of page_mapcount() to the places where it is
absolutely necessary.

If our folio has a stable node, it is a (small) KSM folio -- see
folio_stable_node().  Let's use folio_mapcount() in stable_tree_search()
instead, which results in no functional change.

The mapcount > 1 check is a bit confusing, because that's usually a check
for page sharing.  Looks like the reason is that we are guaranteed to not
exceed ksm_max_page_sharing for the tree KSM folio when merging with that.
Let's update the documentation to make that clearer.

Link: https://lkml.kernel.org/r/20240416172533.663418-1-david@redhat.com


Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Alex Shi <alexs@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>