X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=arch%2Farm64%2Fmm%2Finit.c;h=325f89ff897ea8f24a32d361939742294a4aaa19;hb=c6a9c8e51b188d049496643db2cfbb67df65190c;hp=17bf39ac83ba073109118817c3ab72346ae3824b;hpb=c0d6fe2f01c475cc137d90607a07578586883df8;p=firefly-linux-kernel-4.4.55.git

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 17bf39ac83ba..325f89ff897e 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -118,9 +118,11 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
 }
 
 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
+#define PFN_MASK ((1UL << (64 - PAGE_SHIFT)) - 1)
+
 int pfn_valid(unsigned long pfn)
 {
-	return memblock_is_memory(pfn << PAGE_SHIFT);
+	return (pfn & PFN_MASK) == pfn && memblock_is_memory(pfn << PAGE_SHIFT);
 }
 EXPORT_SYMBOL(pfn_valid);
 #endif