arm64: check for upper PAGE_SHIFT bits in pfn_valid()

[firefly-linux-kernel-4.4.55.git] / arch / arm64 / mm / init.c

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 17bf39ac83ba073109118817c3ab72346ae3824b..325f89ff897ea8f24a32d361939742294a4aaa19 100644 (file)
--- 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