Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/smc/smc_llc.h b/net/smc/smc_llc.h
index 9e2ff08..461c0c3 100644
--- a/net/smc/smc_llc.h
+++ b/net/smc/smc_llc.h
@@ -49,6 +49,8 @@
 void smc_llc_link_clear(struct smc_link *link);
 int smc_llc_do_confirm_rkey(struct smc_link *link,
 			    struct smc_buf_desc *rmb_desc);
+int smc_llc_do_delete_rkey(struct smc_link *link,
+			   struct smc_buf_desc *rmb_desc);
 int smc_llc_init(void) __init;
 
 #endif /* SMC_LLC_H */