---

yaml --- r: 299275 b: refs/heads/master c: e5ab858 h: refs/heads/master i: 299273: 244a67f 299271: d0fe8f5 v: v3
git-mirror · Apr 15, 2012 · 8d4f411 · 8d4f411
1 parent bf96797
commit 8d4f411
Show file tree

Hide file tree

Showing 2 changed files with 16 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9f85550347f51c79a917b2aec04c90691c11e20a
+refs/heads/master: e5ab85800820edd907d3f43f285e1232f84d5a41
diff --git a/trunk/arch/arm/kernel/setup.c b/trunk/arch/arm/kernel/setup.c
@@ -523,7 +523,21 @@ int __init arm_add_memory(phys_addr_t start, unsigned long size)
 	 */
 	size -= start & ~PAGE_MASK;
 	bank->start = PAGE_ALIGN(start);
-	bank->size  = size & PAGE_MASK;
+
+#ifndef CONFIG_LPAE
+	if (bank->start + size < bank->start) {
+		printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
+			"32-bit physical address space\n", (long long)start);
+		/*
+		 * To ensure bank->start + bank->size is representable in
+		 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
+		 * This means we lose a page after masking.
+		 */
+		size = ULONG_MAX - bank->start;
+	}
+#endif
+
+	bank->size = size & PAGE_MASK;
 
 	/*
 	 * Check whether this memory region has non-zero size or