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-rw-r--r--include/linux/swap.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 7f47b7098b1b..279c7b84bd63 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -176,6 +176,12 @@ enum {
* protected by swap_info_struct.lock.
*/
struct swap_cluster_info {
+ spinlock_t lock; /*
+ * Protect swap_cluster_info fields
+ * and swap_info_struct->swap_map
+ * elements correspond to the swap
+ * cluster
+ */
unsigned int data:24;
unsigned int flags:8;
};