1 files changed, 43 insertions, 0 deletions

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index 6471f1bdae96..ebfcbfa8b7f2 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -102,7 +102,50 @@ out_err:
         free_msg(msg);
         return ERR_PTR(err);
 }
+#ifdef CONFIG_CHECKPOINT_RESTORE
+struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
+{
+        struct msg_msgseg *dst_pseg, *src_pseg;
+        int len = src->m_ts;
+        int alen;
+
+        BUG_ON(dst == NULL);
+        if (src->m_ts > dst->m_ts)
+                return ERR_PTR(-EINVAL);
 
+        alen = len;
+        if (alen > DATALEN_MSG)
+                alen = DATALEN_MSG;
+
+        dst->next = NULL;
+        dst->security = NULL;
+
+        memcpy(dst + 1, src + 1, alen);
+
+        len -= alen;
+        dst_pseg = dst->next;
+        src_pseg = src->next;
+        while (len > 0) {
+                alen = len;
+                if (alen > DATALEN_SEG)
+                        alen = DATALEN_SEG;
+                memcpy(dst_pseg + 1, src_pseg + 1, alen);
+                dst_pseg = dst_pseg->next;
+                len -= alen;
+                src_pseg = src_pseg->next;
+        }
+
+        dst->m_type = src->m_type;
+        dst->m_ts = src->m_ts;
+
+        return dst;
+}
+#else
+struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
+{
+        return ERR_PTR(-ENOSYS);
+}
+#endif
 int store_msg(void __user *dest, struct msg_msg *msg, int len)
 {
         int alen;