mm/khugepaged: fix outdated comments

Fix comment in collapse_scan_pmd() that still described the old
folio_mapcount() > folio_ref_count() check and a "512" false-positive
scenario.  The code now uses folio_expected_ref_count() !=
folio_ref_count() which doesn't suffer from the same limitation.

Fix comment in collapse_huge_page() that referenced ptep_clear_flush, when
the code actually uses pmdp_collapse_flush.

Fix comment in __collapse_huge_page_swapin() that referenced the old
function name khugepaged_scan_pmd, now collapse_scan_pmd.

Also clean up some simple typos and stale terminology (mmap_sem ->
mmap_lock, PG_lock -> folio lock, page -> folio, grammar).

We also clarify a comment regarding where the max_ptes_none check is
deferred to in mthp_collapse() from the original collapse_scan_pmd check.

Update all comments that references a function to include parentheses.

[nico.pache@linux.dev: fix outdated comments]
  Link: https://lore.kernel.org/1c96e2f3-802f-472b-81e6-4af17a721a3c@linux.dev
Link: https://lore.kernel.org/20260811-khugepaged_pte_refactor-v4-4-ddac39d61c4a@linux.dev
Signed-off-by: Nico Pache (Red Hat) <nico.pache@linux.dev>
Acked-by: Usama Arif <usama.arif@linux.dev>
Assisted-by: Cursor(claude-sonnet-4):4.6
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

0 files changed, 0 insertions, 0 deletions