From 31b259049e2b932ae6527d1dc850c2bec58e94e0 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Sat, 31 Jan 2026 12:10:56 -0500
Subject: [PATCH] riscv: Enable the zifencei extension explicitly in -march

clang is more tolerant and implies this extension whereas GCC is
stricter and requires it to be included.

Reviewed by:	mhorne
Differential Revision:	https://reviews.freebsd.org/D54965
---
 sys/conf/kern.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index e86ffb684f9..af7b1589c5c 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -166,7 +166,7 @@ INLINE_LIMIT?=	8000
 # code model as "medium" and "medany" respectively.
 #
 .if ${MACHINE_CPUARCH} == "riscv"
-CFLAGS+=	-march=rv64imafdch
+CFLAGS+=	-march=rv64imafdch_zifencei
 CFLAGS+=	-mabi=lp64
 CFLAGS.clang+=	-mcmodel=medium
 CFLAGS.gcc+=	-mcmodel=medany