[Devel] [PATCH] IA64: virt_to_page() can be called with NULL arg

[Kirill Korotaev]

[IA64] virt_to_page() cannot be called with NULL (mainstream bug)

It does not return NULL when arg is NULL.

Signed-Off-By: Alexey Kuznetsov <kuznet at ms2.inr.ac.ru>
Signed-Off-By: Kirill Korotaev <dev at openvz.org>

--- linus-2.6.git/include/asm-ia64/pgalloc.h.orig	2006-12-18 14:59:09.000000000 +0300
+++ linus-2.6.git/include/asm-ia64/pgalloc.h	2006-12-18 15:07:44.000000000 +0300
@@ -137,7 +137,8 @@ pmd_populate_kernel(struct mm_struct *mm
 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 					 unsigned long addr)
 {
-	return virt_to_page(pgtable_quicklist_alloc());
+	void *pg = pgtable_quicklist_alloc();
+	return pg ? virt_to_page(pg) : NULL;
 }
 
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,