hugetlbfs: cleanup some comments in inode.c

The function generic_file_buffered_read has been renamed to filemap_read
since commit 87fa0f3 ("mm/filemap: rename generic_file_buffered_read
to filemap_read").  Update the corresponding comment.  And duplicated
taken in hugetlbfs_fill_super is removed.

Link: https://lkml.kernel.org/r/20220726142918.51693-5-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: MiaoheLin

fs/hugetlbfs/inode.c

@@ -323,8 +323,7 @@ hugetlbfs_read_actor(struct page *page, unsigned long offset,
 
 /*
  * Support for read() - Find the page attached to f_mapping and copy out the
- * data. Its *very* similar to generic_file_buffered_read(), we can't use that
- * since it has PAGE_SIZE assumptions.
+ * data. This provides functionality similar to filemap_read().
  */
 static ssize_t hugetlbfs_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
@@ -1394,7 +1393,7 @@ hugetlbfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	/*
 	 * Allocate and initialize subpool if maximum or minimum size is
 	 * specified.  Any needed reservations (for minimum size) are taken
-	 * taken when the subpool is created.
+	 * when the subpool is created.
 	 */
 	if (ctx->max_hpages != -1 || ctx->min_hpages != -1) {
 		sbinfo->spool = hugepage_new_subpool(ctx->hstate,