perf kmem: use ARRAY_SIZE instead of reinventing it

[~andy/linux] / ipc / msgutil.c

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index 6471f1bdae96f2c6650a3c369bb77d0dc357d388..ebfcbfa8b7f25a4193dcfd196963e4b87428a6e6 100644 (file)
--- 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;