@@ -24,6 +24,7 @@ struct notifier_block; /* in notifier.h
#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
#define VM_NO_GUARD 0x00000040 /* don't add guard page */
#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
+#define VM_MAP_PUT_PAGES 0x00000100 /* put pages and free array in vfree */
/*
* VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC.
@@ -2377,8 +2377,11 @@ EXPORT_SYMBOL(vunmap);
* @flags: vm_area->flags
* @prot: page protection for the mapping
*
- * Maps @count pages from @pages into contiguous kernel virtual
- * space.
+ * Maps @count pages from @pages into contiguous kernel virtual space.
+ * If @flags contains %VM_MAP_PUT_PAGES the ownership of the pages array itself
+ * (which must be kmalloc or vmalloc memory) and one reference per pages in it
+ * are transferred from the caller to vmap(), and will be freed / dropped when
+ * vfree() is called on the return value.
*
* Return: the address of the area or %NULL on failure
*/
@@ -2404,6 +2407,8 @@ void *vmap(struct page **pages, unsigned
return NULL;
}
+ if (flags & VM_MAP_PUT_PAGES)
+ area->pages = pages;
return area->addr;
}
EXPORT_SYMBOL(vmap);