In preparation for the atomic restore, get a page that can safely be used
during the restore - ie, that isn't a location of a page that will be
restored.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/pagedir.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/kernel/power/pagedir.c b/kernel/power/pagedir.c
index c23ca58..4cdc0ef 100644
--- a/kernel/power/pagedir.c
+++ b/kernel/power/pagedir.c
@@ -270,3 +270,21 @@ void suspend_mark_pages_for_pageset2(voi
}
+/* suspend_get_nonconflicting_page
+ *
+ * Description: Gets order zero pages that won't be overwritten
+ * while copying the original pages.
+ */
+
+unsigned long suspend_get_nonconflicting_page(void)
+{
+ struct page *page;
+
+ do {
+ page = alloc_pages(GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO, 0);
+ BUG_ON(!page);
+ } while(PagePageset1(page));
+
+ return (unsigned long) page_address(page);
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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