This routine prepares the list of page backup entries that is used by the
swsusp lowlevel code in doing the atomic restore.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/atomic_copy.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/kernel/power/atomic_copy.c b/kernel/power/atomic_copy.c
index 6d1bc68..556e481 100644
--- a/kernel/power/atomic_copy.c
+++ b/kernel/power/atomic_copy.c
@@ -135,3 +135,53 @@ static unsigned long __suspend_get_next_
return counter;
}
+/*
+ * prepare_suspend2_pbe_list
+ *
+ * Prepare pageset2 pages for doing the atomic copy. If necessary,
+ * we allocate extra pages.
+ *
+ */
+
+void prepare_suspend2_pbe_list(void)
+{
+ int orig_pfn, copy_pfn, i = 1;
+ struct pbe *this_pbe = NULL, *last_pbe = NULL;
+
+ orig_pfn = copy_pfn = -1;
+
+ pagedir_nosave = NULL;
+
+ do {
+ if (!this_pbe ||
+ ((((unsigned long) this_pbe) & (PAGE_SIZE - 1))
+ + 2 * sizeof(struct pbe)) > PAGE_SIZE) {
+ /* Get the next page for pbes */
+ this_pbe = (struct pbe *) suspend_get_nonconflicting_page();
+ BUG_ON(!this_pbe);
+ BUG_ON(PagePageset1(virt_to_page(this_pbe)));
+ } else
+ this_pbe++;
+
+ do {
+ orig_pfn = get_next_bit_on(pageset1_map, orig_pfn);
+ if (orig_pfn < 0)
+ return;
+ copy_pfn = get_next_bit_on(pageset1_copy_map, copy_pfn);
+ } while (PageHighMem(pfn_to_page(orig_pfn)));
+
+ if (!last_pbe)
+ pagedir_nosave = this_pbe;
+ else
+ last_pbe->next = this_pbe;
+
+ last_pbe = this_pbe;
+ this_pbe->orig_address = (unsigned long) page_address(pfn_to_page(orig_pfn));
+ this_pbe->address = (unsigned long) page_address(pfn_to_page(copy_pfn));
+ this_pbe->next = NULL; /* get_nonconflicting_page doesn't get zeroed pages */
+
+ i++;
+
+ } while (1);
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
-
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