Commit 
452e9e6992fe ("filemap: Add filemap_remove_folio and
__filemap_remove_folio") reimplemented __delete_from_page_cache() as
__filemap_remove_folio() and delete_from_page_cache() as
filemap_remove_folio().  The compatibility wrappers were finally removed
in 
ece62684dcfb ("hugetlbfs: convert hugetlb_delete_from_page_cache() to
use folios") and 
6ffcd825e7d0 ("mm: Remove __delete_from_page_cache()").
Update the remaining references to dead functions in the memcg
implementation memo.
Signed-off-by: Illia Ostapyshyn <illia@yshyn.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 
        The logic is very clear. (About migration, see below)
 
        Note:
-         __remove_from_page_cache() is called by remove_from_page_cache()
+         __filemap_remove_folio() is called by filemap_remove_folio()
          and __remove_mapping().
 
 6. Shmem(tmpfs) Page Cache