mm: remove hmm_vma_alloc_locked_page

The only user of it has just been removed, and there wasn't really any need
to wrap a basic memory allocator to start with.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

mm/hmm.c

@@ -1330,20 +1330,6 @@ EXPORT_SYMBOL(hmm_range_dma_unmap);
 
 
 #if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
-struct page *hmm_vma_alloc_locked_page(struct vm_area_struct *vma,
-				       unsigned long addr)
-{
-	struct page *page;
-
-	page = alloc_page_vma(GFP_HIGHUSER, vma, addr);
-	if (!page)
-		return NULL;
-	lock_page(page);
-	return page;
-}
-EXPORT_SYMBOL(hmm_vma_alloc_locked_page);
-
-
 static void hmm_devmem_ref_release(struct percpu_ref *ref)
 {
 	struct hmm_devmem *devmem;