X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=mm%2Fvmalloc.c;h=7b450798b458874f4f835aba6be4acb8da1cb35d;hb=075395d228641646159dae3dd170fa3fc6ff477a;hp=729eb3eec75fd7043b8b8a74e6b748b9390b0f6d;hpb=2f67bdb23d74a6c6fd4f98f64239c5c34d1833cc;p=powerpc.git

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 729eb3eec7..7b450798b4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -256,6 +256,19 @@ struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags, int
 	return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node);
 }
 
+/* Caller must hold vmlist_lock */
+static struct vm_struct *__find_vm_area(void *addr)
+{
+	struct vm_struct *tmp;
+
+	for (tmp = vmlist; tmp != NULL; tmp = tmp->next) {
+		 if (tmp->addr == addr)
+			break;
+	}
+
+	return tmp;
+}
+
 /* Caller must hold vmlist_lock */
 struct vm_struct *__remove_vm_area(void *addr)
 {
@@ -317,12 +330,13 @@ void __vunmap(void *addr, int deallocate_pages)
 		return;
 	}
 
+	debug_check_no_locks_freed(addr, area->size);
+
 	if (deallocate_pages) {
 		int i;
 
 		for (i = 0; i < area->nr_pages; i++) {
-			if (unlikely(!area->pages[i]))
-				BUG();
+			BUG_ON(!area->pages[i]);
 			__free_page(area->pages[i]);
 		}
 
@@ -499,10 +513,32 @@ EXPORT_SYMBOL(__vmalloc);
  */
 void *vmalloc(unsigned long size)
 {
-       return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
+	return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL);
 }
 EXPORT_SYMBOL(vmalloc);
 
+/**
+ *	vmalloc_user  -  allocate virtually contiguous memory which has
+ *			   been zeroed so it can be mapped to userspace without
+ *			   leaking data.
+ *
+ *	@size:		allocation size
+ */
+void *vmalloc_user(unsigned long size)
+{
+	struct vm_struct *area;
+	void *ret;
+
+	ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
+	write_lock(&vmlist_lock);
+	area = __find_vm_area(ret);
+	area->flags |= VM_USERMAP;
+	write_unlock(&vmlist_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(vmalloc_user);
+
 /**
  *	vmalloc_node  -  allocate memory on a specific node
  *
@@ -517,7 +553,7 @@ EXPORT_SYMBOL(vmalloc);
  */
 void *vmalloc_node(unsigned long size, int node)
 {
-       return __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL, node);
+	return __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL, node);
 }
 EXPORT_SYMBOL(vmalloc_node);
 
@@ -557,6 +593,28 @@ void *vmalloc_32(unsigned long size)
 }
 EXPORT_SYMBOL(vmalloc_32);
 
+/**
+ *	vmalloc_32_user  -  allocate virtually contiguous memory (32bit
+ *			      addressable) which is zeroed so it can be
+ *			      mapped to userspace without leaking data.
+ *
+ *	@size:		allocation size
+ */
+void *vmalloc_32_user(unsigned long size)
+{
+	struct vm_struct *area;
+	void *ret;
+
+	ret = __vmalloc(size, GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL);
+	write_lock(&vmlist_lock);
+	area = __find_vm_area(ret);
+	area->flags |= VM_USERMAP;
+	write_unlock(&vmlist_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(vmalloc_32_user);
+
 long vread(char *buf, char *addr, unsigned long count)
 {
 	struct vm_struct *tmp;
@@ -631,3 +689,64 @@ finished:
 	read_unlock(&vmlist_lock);
 	return buf - buf_start;
 }
+
+/**
+ *	remap_vmalloc_range  -  map vmalloc pages to userspace
+ *
+ *	@vma:		vma to cover (map full range of vma)
+ *	@addr:		vmalloc memory
+ *	@pgoff:		number of pages into addr before first page to map
+ *	@returns:	0 for success, -Exxx on failure
+ *
+ *	This function checks that addr is a valid vmalloc'ed area, and
+ *	that it is big enough to cover the vma. Will return failure if
+ *	that criteria isn't met.
+ *
+ *	Similar to remap_pfn_range (see mm/memory.c)
+ */
+int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
+						unsigned long pgoff)
+{
+	struct vm_struct *area;
+	unsigned long uaddr = vma->vm_start;
+	unsigned long usize = vma->vm_end - vma->vm_start;
+	int ret;
+
+	if ((PAGE_SIZE-1) & (unsigned long)addr)
+		return -EINVAL;
+
+	read_lock(&vmlist_lock);
+	area = __find_vm_area(addr);
+	if (!area)
+		goto out_einval_locked;
+
+	if (!(area->flags & VM_USERMAP))
+		goto out_einval_locked;
+
+	if (usize + (pgoff << PAGE_SHIFT) > area->size - PAGE_SIZE)
+		goto out_einval_locked;
+	read_unlock(&vmlist_lock);
+
+	addr += pgoff << PAGE_SHIFT;
+	do {
+		struct page *page = vmalloc_to_page(addr);
+		ret = vm_insert_page(vma, uaddr, page);
+		if (ret)
+			return ret;
+
+		uaddr += PAGE_SIZE;
+		addr += PAGE_SIZE;
+		usize -= PAGE_SIZE;
+	} while (usize > 0);
+
+	/* Prevent "things" like memory migration? VM_flags need a cleanup... */
+	vma->vm_flags |= VM_RESERVED;
+
+	return ret;
+
+out_einval_locked:
+	read_unlock(&vmlist_lock);
+	return -EINVAL;
+}
+EXPORT_SYMBOL(remap_vmalloc_range);
+