---

yaml
---
r: 272135
b: refs/heads/master
c: f5252e0
h: refs/heads/master
i:
  272133: a0ea1a3
  272131: 5512767
  272127: f5e194b
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8c5fb8eadde41f67c61a7ac2d3246dab87bf7020
+refs/heads/master: f5252e009d5b87071a919221e4f6624184005368

trunk/include/linux/vmalloc.h

@@ -13,6 +13,7 @@ struct vm_area_struct;		/* vma defining user mapping in mm_types.h */
 #define VM_MAP		0x00000004	/* vmap()ed pages */
 #define VM_USERMAP	0x00000008	/* suitable for remap_vmalloc_range */
 #define VM_VPAGES	0x00000010	/* buffer for pages was vmalloc'ed */
+#define VM_UNLIST	0x00000020	/* vm_struct is not listed in vmlist */
 /* bits [20..32] reserved for arch specific ioremap internals */
 
 /*

trunk/mm/vmalloc.c

@@ -1253,18 +1253,22 @@ EXPORT_SYMBOL_GPL(map_vm_area);
 DEFINE_RWLOCK(vmlist_lock);
 struct vm_struct *vmlist;
 
-static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
+static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
 			      unsigned long flags, void *caller)
 {
-	struct vm_struct *tmp, **p;
-
 	vm->flags = flags;
 	vm->addr = (void *)va->va_start;
 	vm->size = va->va_end - va->va_start;
 	vm->caller = caller;
 	va->private = vm;
 	va->flags |= VM_VM_AREA;
+}
+
+static void insert_vmalloc_vmlist(struct vm_struct *vm)
+{
+	struct vm_struct *tmp, **p;
 
+	vm->flags &= ~VM_UNLIST;
 	write_lock(&vmlist_lock);
 	for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
 		if (tmp->addr >= vm->addr)
@@ -1275,6 +1279,13 @@ static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
 	write_unlock(&vmlist_lock);
 }
 
+static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
+			      unsigned long flags, void *caller)
+{
+	setup_vmalloc_vm(vm, va, flags, caller);
+	insert_vmalloc_vmlist(vm);
+}
+
 static struct vm_struct *__get_vm_area_node(unsigned long size,
 		unsigned long align, unsigned long flags, unsigned long start,
 		unsigned long end, int node, gfp_t gfp_mask, void *caller)
@@ -1313,7 +1324,18 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
 		return NULL;
 	}
 
-	insert_vmalloc_vm(area, va, flags, caller);
+	/*
+	 * When this function is called from __vmalloc_node_range,
+	 * we do not add vm_struct to vmlist here to avoid
+	 * accessing uninitialized members of vm_struct such as
+	 * pages and nr_pages fields. They will be set later.
+	 * To distinguish it from others, we use a VM_UNLIST flag.
+	 */
+	if (flags & VM_UNLIST)
+		setup_vmalloc_vm(area, va, flags, caller);
+	else
+		insert_vmalloc_vm(area, va, flags, caller);
+
 	return area;
 }
 
@@ -1381,17 +1403,20 @@ struct vm_struct *remove_vm_area(const void *addr)
 	va = find_vmap_area((unsigned long)addr);
 	if (va && va->flags & VM_VM_AREA) {
 		struct vm_struct *vm = va->private;
-		struct vm_struct *tmp, **p;
-		/*
-		 * remove from list and disallow access to this vm_struct
-		 * before unmap. (address range confliction is maintained by
-		 * vmap.)
-		 */
-		write_lock(&vmlist_lock);
-		for (p = &vmlist; (tmp = *p) != vm; p = &tmp->next)
-			;
-		*p = tmp->next;
-		write_unlock(&vmlist_lock);
+
+		if (!(vm->flags & VM_UNLIST)) {
+			struct vm_struct *tmp, **p;
+			/*
+			 * remove from list and disallow access to
+			 * this vm_struct before unmap. (address range
+			 * confliction is maintained by vmap.)
+			 */
+			write_lock(&vmlist_lock);
+			for (p = &vmlist; (tmp = *p) != vm; p = &tmp->next)
+				;
+			*p = tmp->next;
+			write_unlock(&vmlist_lock);
+		}
 
 		vmap_debug_free_range(va->va_start, va->va_end);
 		free_unmap_vmap_area(va);
@@ -1602,14 +1627,20 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
 	if (!size || (size >> PAGE_SHIFT) > totalram_pages)
 		return NULL;
 
-	area = __get_vm_area_node(size, align, VM_ALLOC, start, end, node,
-				  gfp_mask, caller);
+	area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNLIST,
+				  start, end, node, gfp_mask, caller);
 
 	if (!area)
 		return NULL;
 
 	addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
 
+	/*
+	 * In this function, newly allocated vm_struct is not added
+	 * to vmlist at __get_vm_area_node(). so, it is added here.
+	 */
+	insert_vmalloc_vmlist(area);
+
 	/*
 	 * A ref_count = 3 is needed because the vm_struct and vmap_area
 	 * structures allocated in the __get_vm_area_node() function contain