unicore32: handle pgtable_page_ctor() fail

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/unicore32/include/asm/pgalloc.h

@@ -51,12 +51,14 @@ pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 	struct page *pte;
 
 	pte = alloc_pages(PGALLOC_GFP, 0);
-	if (pte) {
+	if (!pte)
+		return NULL;
 	if (!PageHighMem(pte)) {
 		void *page = page_address(pte);
 		clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
 	}
-		pgtable_page_ctor(pte);
+	if (!pgtable_page_ctor(pte)) {
+		__free_page(pte);
 	}
 
 	return pte;