[Suspend2][ 2/9] [Suspend2] Free extra memory allocated for the atomic copy.

[Nigel Cunningham <nigel@suspend2.net>]

If the page cache is not large enough to store the atomic copy, we allocate
extra pages. This routine is used at cleanup to free that memory.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/pagedir.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/kernel/power/pagedir.c b/kernel/power/pagedir.c
index 1e0995e..9c26990 100644
--- a/kernel/power/pagedir.c
+++ b/kernel/power/pagedir.c
@@ -31,3 +31,26 @@ struct extras {
 	struct extras *next;
 } *extras_list;
 
+/* suspend_free_extra_pagedir_memory
+ *
+ * Description:	Free previously allocated extra pagedir memory.
+ */
+void suspend_free_extra_pagedir_memory(void)
+{
+	/* Free allocated pages */
+	while (extras_list) {
+		struct extras *this = extras_list;
+		int i;
+
+		extras_list = this->next;
+
+		for (i = 0; i < (1 << this->order); i++)
+			ClearPageNosave(this->page + i);
+
+		__free_pages(this->page, this->order);
+		kfree(this);
+	}
+
+	extra_pagedir_pages_allocated = 0;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net