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-rw-r--r--kernel/power/power.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 1f8052b..a64d3f2 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -140,6 +140,9 @@ struct resume_swap_area {
#define PMOPS_ENTER 2
#define PMOPS_FINISH 3
+/* If unset, the snapshot device cannot be open. */
+extern atomic_t snapshot_device_available;
+
/**
* The bitmap is used for tracing allocated swap pages
*