hugetlbfs: remove special hugetlbfs_set_page_dirty()

Matthew Wilcox noticed that hugetlbfs_set_page_dirty always returns 0.
Instead, it should return 1 or 0 depending on the previous state of the
dirty bit.  In addition, the call to compound_head is redundant as it is
also performed in calling routine set_page_dirty.

Replace the hugetlbfs specific routine hugetlbfs_set_page_dirty with
__set_page_dirty_no_writeback as it addresses both of these issues.

Link: https://lkml.kernel.org/r/20201221192542.15732-2-mike.kravetz@oracle.com


Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>